diff --git a/scrapling/core/_types.py b/scrapling/core/_types.py
index f19e706..f2fc097 100644
--- a/scrapling/core/_types.py
+++ b/scrapling/core/_types.py
@@ -32,6 +32,7 @@ from typing import (
     Coroutine,
     SupportsIndex,
 )
+from typing_extensions import Self, Unpack
 
 # Proxy can be a string URL or a dict (Playwright format: {"server": "...", "username": "...", "password": "..."})
 ProxyType = Union[str, Dict[str, str]]
@@ -41,27 +42,6 @@ PageLoadStates = Literal["commit", "domcontentloaded", "load", "networkidle"]
 extraction_types = Literal["text", "html", "markdown"]
 StrOrBytes = Union[str, bytes]
 
-if TYPE_CHECKING:  # pragma: no cover
-    from typing_extensions import Unpack
-else:  # pragma: no cover
-
-    class _Unpack:
-        @staticmethod
-        def __getitem__(*args, **kwargs):
-            pass
-
-    Unpack = _Unpack()
-
-
-try:
-    # Python 3.11+
-    from typing import Self  # novermin
-except ImportError:  # pragma: no cover
-    try:
-        from typing_extensions import Self  # Backport
-    except ImportError:
-        Self = object
-
 
 # Copied from `playwright._impl._api_structures.SetCookieParam`
 class SetCookieParam(TypedDict, total=False):
diff --git a/scrapling/core/custom_types.py b/scrapling/core/custom_types.py
index 45ab4d5..d06ac29 100644
--- a/scrapling/core/custom_types.py
+++ b/scrapling/core/custom_types.py
@@ -35,9 +35,7 @@ class TextHandler(str):
         lst = super().__getitem__(key)
         return TextHandler(lst)
 
-    def split(
-        self, sep: str | None = None, maxsplit: SupportsIndex = -1
-    ) -> Union[List, "TextHandlers"]:  # pragma: no cover
+    def split(self, sep: str | None = None, maxsplit: SupportsIndex = -1) -> list[Any]:  # pragma: no cover
         return TextHandlers([TextHandler(s) for s in super().split(sep, maxsplit)])
 
     def strip(self, chars: str | None = None) -> Union[str, "TextHandler"]:  # pragma: no cover
@@ -61,7 +59,7 @@ class TextHandler(str):
     def expandtabs(self, tabsize: SupportsIndex = 8) -> Union[str, "TextHandler"]:  # pragma: no cover
         return TextHandler(super().expandtabs(tabsize))
 
-    def format(self, *args: object, **kwargs: str) -> Union[str, "TextHandler"]:  # pragma: no cover
+    def format(self, *args: object, **kwargs: object) -> Union[str, "TextHandler"]:  # pragma: no cover
         return TextHandler(super().format(*args, **kwargs))
 
     def format_map(self, mapping) -> Union[str, "TextHandler"]:  # pragma: no cover
@@ -291,7 +289,7 @@ class AttributesHandler(Mapping[str, _TextHandlerType]):
 
     __slots__ = ("_data",)
 
-    def __init__(self, mapping=None, **kwargs):
+    def __init__(self, mapping: Any = None, **kwargs: Any) -> None:
         mapping = (
             {key: TextHandler(value) if isinstance(value, str) else value for key, value in mapping.items()}
             if mapping is not None
@@ -324,8 +322,8 @@ class AttributesHandler(Mapping[str, _TextHandlerType]):
                     yield AttributesHandler({key: value})
 
     @property
-    def json_string(self):
-        """Convert current attributes to JSON string if the attributes are JSON serializable otherwise throws error"""
+    def json_string(self) -> bytes:
+        """Convert current attributes to JSON bytes if the attributes are JSON serializable otherwise throws error"""
         return dumps(dict(self._data))
 
     def __getitem__(self, key: str) -> _TextHandlerType:
diff --git a/scrapling/core/mixins.py b/scrapling/core/mixins.py
index 0b66c07..c2e7420 100644
--- a/scrapling/core/mixins.py
+++ b/scrapling/core/mixins.py
@@ -1,7 +1,4 @@
-from scrapling.core._types import TYPE_CHECKING
-
-if TYPE_CHECKING:
-    from scrapling.parser import Selector
+from scrapling.core._types import Any, Dict
 
 
 class SelectorsGeneration:
@@ -11,7 +8,11 @@ class SelectorsGeneration:
     Inspiration: https://searchfox.org/mozilla-central/source/devtools/shared/inspector/css-logic.js#591
     """
 
-    def _general_selection(self: "Selector", selection: str = "css", full_path: bool = False) -> str:  # type: ignore[name-defined]
+    # Note: This is a mixin class meant to be used with Selector.
+    # The methods access Selector attributes (._root, .parent, .attrib, .tag, etc.)
+    # through self, which will be a Selector instance at runtime.
+
+    def _general_selection(self: Any, selection: str = "css", full_path: bool = False) -> str:
         """Generate a selector for the current element.
         :return: A string of the generated selector.
         """
@@ -36,7 +37,7 @@ class SelectorsGeneration:
                     # if classes and css:
                     #     part += f".{'.'.join(classes)}"
                     # else:
-                    counter = {}
+                    counter: Dict[str, int] = {}
                     for child in target.parent.children:
                         counter.setdefault(child.tag, 0)
                         counter[child.tag] += 1
@@ -56,28 +57,28 @@ class SelectorsGeneration:
         return " > ".join(reversed(selectorPath)) if css else "//" + "/".join(reversed(selectorPath))
 
     @property
-    def generate_css_selector(self: "Selector") -> str:  # type: ignore[name-defined]
+    def generate_css_selector(self: Any) -> str:
         """Generate a CSS selector for the current element
         :return: A string of the generated selector.
         """
         return self._general_selection()
 
     @property
-    def generate_full_css_selector(self: "Selector") -> str:  # type: ignore[name-defined]
+    def generate_full_css_selector(self: Any) -> str:
         """Generate a complete CSS selector for the current element
         :return: A string of the generated selector.
         """
         return self._general_selection(full_path=True)
 
     @property
-    def generate_xpath_selector(self: "Selector") -> str:  # type: ignore[name-defined]
+    def generate_xpath_selector(self: Any) -> str:
         """Generate an XPath selector for the current element
         :return: A string of the generated selector.
         """
         return self._general_selection("xpath")
 
     @property
-    def generate_full_xpath_selector(self: "Selector") -> str:  # type: ignore[name-defined]
+    def generate_full_xpath_selector(self: Any) -> str:
         """Generate a complete XPath selector for the current element
         :return: A string of the generated selector.
         """
diff --git a/scrapling/core/shell.py b/scrapling/core/shell.py
index 3a1511e..0bd6efc 100644
--- a/scrapling/core/shell.py
+++ b/scrapling/core/shell.py
@@ -30,6 +30,7 @@ from scrapling.core.custom_types import TextHandler
 from scrapling.engines.toolbelt.custom import Response
 from scrapling.core.utils._shell import _ParseHeaders, _CookieParser
 from scrapling.core._types import (
+    Callable,
     Dict,
     Any,
     cast,
@@ -82,7 +83,7 @@ class NoExitArgumentParser(ArgumentParser):  # pragma: no cover
 class CurlParser:
     """Builds the argument parser for relevant curl flags from DevTools."""
 
-    def __init__(self):
+    def __init__(self) -> None:
         from scrapling.fetchers import Fetcher as __Fetcher
 
         self.__fetcher = __Fetcher
@@ -467,19 +468,21 @@ Type 'exit' or press Ctrl+D to exit.
 
         return result
 
-    def create_wrapper(self, func, get_signature=True, signature_name=None):
+    def create_wrapper(
+        self, func: Callable, get_signature: bool = True, signature_name: Optional[str] = None
+    ) -> Callable:
         """Create a wrapper that preserves function signature but updates page"""
 
         @wraps(func)
-        def wrapper(*args, **kwargs):
+        def wrapper(*args: Any, **kwargs: Any) -> Any:
             result = func(*args, **kwargs)
             return self.update_page(result)
 
         if get_signature:
             # Explicitly preserve and unpack signature for IPython introspection and autocompletion
-            wrapper.__signature__ = _unpack_signature(func, signature_name)  # pyright: ignore
+            setattr(wrapper, "__signature__", _unpack_signature(func, signature_name))
         else:
-            wrapper.__signature__ = signature(func)  # pyright: ignore
+            setattr(wrapper, "__signature__", signature(func))
 
         return wrapper
 
@@ -601,7 +604,7 @@ class Convertor:
                             " ",
                         ):
                             # Remove consecutive white-spaces
-                            txt_content = re_sub(f"[{s}]+", s, txt_content)
+                            txt_content = TextHandler(re_sub(f"[{s}]+", s, txt_content))
                         yield txt_content
             yield ""
 
diff --git a/scrapling/core/storage.py b/scrapling/core/storage.py
index 8e04599..d93a320 100644
--- a/scrapling/core/storage.py
+++ b/scrapling/core/storage.py
@@ -63,12 +63,11 @@ class StorageSystemMixin(ABC):  # pragma: no cover
     def _get_hash(identifier: str) -> str:
         """If you want to hash identifier in your storage system, use this safer"""
         _identifier = identifier.lower().strip()
-        if isinstance(_identifier, str):
-            # Hash functions have to take bytes
-            _identifier = _identifier.encode("utf-8")
+        # Hash functions have to take bytes
+        _identifier_bytes = _identifier.encode("utf-8")
 
-        hash_value = sha256(_identifier).hexdigest()
-        return f"{hash_value}_{len(_identifier)}"  # Length to reduce collision chance
+        hash_value = sha256(_identifier_bytes).hexdigest()
+        return f"{hash_value}_{len(_identifier_bytes)}"  # Length to reduce collision chance
 
 
 @lru_cache(1, typed=True)
diff --git a/scrapling/engines/_browsers/_base.py b/scrapling/engines/_browsers/_base.py
index 8bd442d..e379882 100644
--- a/scrapling/engines/_browsers/_base.py
+++ b/scrapling/engines/_browsers/_base.py
@@ -5,16 +5,12 @@ from contextlib import contextmanager, asynccontextmanager
 from playwright.sync_api._generated import Page
 from playwright.sync_api import (
     Frame,
-    Browser,
     BrowserContext,
-    Playwright,
     Response as SyncPlaywrightResponse,
 )
 from playwright.async_api._generated import Page as AsyncPage
 from playwright.async_api import (
     Frame as AsyncFrame,
-    Browser as AsyncBrowser,
-    Playwright as AsyncPlaywright,
     Response as AsyncPlaywrightResponse,
     BrowserContext as AsyncBrowserContext,
 )
@@ -37,6 +33,7 @@ from scrapling.core._types import (
     Optional,
     Callable,
     TYPE_CHECKING,
+    cast,
     overload,
     Tuple,
     ProxyType,
@@ -61,12 +58,12 @@ class SyncSession:
         self.max_pages = max_pages
         self.page_pool = PagePool(max_pages)
         self._max_wait_for_page = 60
-        self.playwright: Playwright | Any = None
-        self.context: BrowserContext | Any = None
-        self.browser: Optional[Browser] = None
+        self.playwright: Any = None
+        self.context: Any = None
+        self.browser: Any = None
         self._is_alive = False
 
-    def start(self):
+    def start(self) -> None:
         pass
 
     def close(self):  # pragma: no cover
@@ -215,13 +212,13 @@ class AsyncSession:
         self.max_pages = max_pages
         self.page_pool = PagePool(max_pages)
         self._max_wait_for_page = 60
-        self.playwright: AsyncPlaywright | Any = None
-        self.context: AsyncBrowserContext | Any = None
-        self.browser: Optional[AsyncBrowser] = None
+        self.playwright: Any = None
+        self.context: Any = None
+        self.browser: Any = None
         self._is_alive = False
         self._lock = Lock()
 
-    async def start(self):
+    async def start(self) -> None:
         pass
 
     async def close(self):
@@ -378,6 +375,8 @@ class AsyncSession:
 
 
 class BaseSessionMixin:
+    _config: "PlaywrightConfig | StealthConfig"
+
     @overload
     def __validate_routine__(self, params: Dict, model: type[StealthConfig]) -> StealthConfig: ...
 
@@ -404,7 +403,7 @@ class BaseSessionMixin:
         return config
 
     def __generate_options__(self, extra_flags: Tuple | None = None) -> None:
-        config: PlaywrightConfig | StealthConfig = self._config  # type: ignore[has-type]
+        config: PlaywrightConfig | StealthConfig = self._config
         self._context_options.update(
             {
                 "proxy": config.proxy,
@@ -466,7 +465,7 @@ class DynamicSessionMixin(BaseSessionMixin):
 
 class StealthySessionMixin(BaseSessionMixin):
     def __validate__(self, **params):
-        self._config: StealthConfig = self.__validate_routine__(params, model=StealthConfig)
+        self._config = self.__validate_routine__(params, model=StealthConfig)
         self._context_options.update(
             {
                 "is_mobile": False,
@@ -482,22 +481,23 @@ class StealthySessionMixin(BaseSessionMixin):
         self.__generate_stealth_options()
 
     def __generate_stealth_options(self) -> None:
-        flags = tuple()
-        if not self._config.cdp_url:
+        config = cast(StealthConfig, self._config)
+        flags: Tuple[str, ...] = tuple()
+        if not config.cdp_url:
             flags = DEFAULT_FLAGS + DEFAULT_STEALTH_FLAGS
 
-            if self._config.block_webrtc:
+            if config.block_webrtc:
                 flags += (
                     "--webrtc-ip-handling-policy=disable_non_proxied_udp",
                     "--force-webrtc-ip-handling-policy",  # Ensures the policy is enforced
                 )
-            if not self._config.allow_webgl:
+            if not config.allow_webgl:
                 flags += (
                     "--disable-webgl",
                     "--disable-webgl-image-chromium",
                     "--disable-webgl2",
                 )
-            if self._config.hide_canvas:
+            if config.hide_canvas:
                 flags += ("--fingerprinting-canvas-image-data-noise",)
 
         super(StealthySessionMixin, self).__generate_options__(flags)
diff --git a/scrapling/engines/_browsers/_controllers.py b/scrapling/engines/_browsers/_controllers.py
index 5f0b247..5d9e801 100644
--- a/scrapling/engines/_browsers/_controllers.py
+++ b/scrapling/engines/_browsers/_controllers.py
@@ -8,11 +8,10 @@ from playwright.sync_api import (
 from playwright.async_api import (
     async_playwright,
     Locator as AsyncLocator,
-    BrowserContext as AsyncBrowserContext,
 )
 
 from scrapling.core.utils import log
-from scrapling.core._types import Unpack
+from scrapling.core._types import Optional, ProxyType, Unpack
 from scrapling.engines.toolbelt.proxy_rotation import is_proxy_error
 from scrapling.engines.toolbelt.convertor import Response, ResponseFactory
 from scrapling.engines.toolbelt.fingerprints import generate_convincing_referer
@@ -134,6 +133,7 @@ class DynamicSession(SyncSession, DynamicSessionMixin):
         )
 
         for attempt in range(self._config.retries):
+            proxy: Optional[ProxyType] = None
             if self._config.proxy_rotator and static_proxy is None:
                 proxy = self._config.proxy_rotator.get_proxy()
             else:
@@ -238,7 +238,7 @@ class AsyncDynamicSession(AsyncSession, DynamicSessionMixin):
         self.__validate__(**kwargs)
         super().__init__(max_pages=self._config.max_pages)
 
-    async def start(self):
+    async def start(self) -> None:
         """Create a browser for this instance and context."""
         if not self.playwright:
             self.playwright = await async_playwright().start()
@@ -246,16 +246,14 @@ class AsyncDynamicSession(AsyncSession, DynamicSessionMixin):
                 if self._config.cdp_url:
                     self.browser = await self.playwright.chromium.connect_over_cdp(endpoint_url=self._config.cdp_url)
                     if not self._config.proxy_rotator and self.browser:
-                        self.context: AsyncBrowserContext = await self.browser.new_context(**self._context_options)
+                        self.context = await self.browser.new_context(**self._context_options)
                 elif self._config.proxy_rotator:
                     self.browser = await self.playwright.chromium.launch(**self._browser_options)
                 else:
                     persistent_options = (
                         self._browser_options | self._context_options | {"user_data_dir": self._user_data_dir}
                     )
-                    self.context: AsyncBrowserContext = await self.playwright.chromium.launch_persistent_context(
-                        **persistent_options
-                    )
+                    self.context = await self.playwright.chromium.launch_persistent_context(**persistent_options)
 
                 if self.context:
                     self.context = await self._initialize_context(self._config, self.context)
@@ -304,6 +302,7 @@ class AsyncDynamicSession(AsyncSession, DynamicSessionMixin):
         )
 
         for attempt in range(self._config.retries):
+            proxy: Optional[ProxyType] = None
             if self._config.proxy_rotator and static_proxy is None:
                 proxy = self._config.proxy_rotator.get_proxy()
             else:
diff --git a/scrapling/engines/_browsers/_page.py b/scrapling/engines/_browsers/_page.py
index 655d3d1..481016e 100644
--- a/scrapling/engines/_browsers/_page.py
+++ b/scrapling/engines/_browsers/_page.py
@@ -61,7 +61,9 @@ class PagePool:
                 raise RuntimeError(f"Maximum page limit ({self.max_pages}) reached")
 
             if isinstance(page, AsyncPage):
-                page_info = cast(PageInfo[AsyncPage], PageInfo(page, "ready", ""))
+                page_info: PageInfo[SyncPage] | PageInfo[AsyncPage] = cast(
+                    PageInfo[AsyncPage], PageInfo(page, "ready", "")
+                )
             else:
                 page_info = cast(PageInfo[SyncPage], PageInfo(page, "ready", ""))
 
diff --git a/scrapling/engines/_browsers/_stealth.py b/scrapling/engines/_browsers/_stealth.py
index 730cd7e..3c9ea58 100644
--- a/scrapling/engines/_browsers/_stealth.py
+++ b/scrapling/engines/_browsers/_stealth.py
@@ -13,7 +13,7 @@ from patchright.sync_api import sync_playwright
 from patchright.async_api import async_playwright
 
 from scrapling.core.utils import log
-from scrapling.core._types import Any, Unpack
+from scrapling.core._types import Any, Optional, ProxyType, Unpack
 from scrapling.engines.toolbelt.proxy_rotation import is_proxy_error
 from scrapling.engines.toolbelt.convertor import Response, ResponseFactory
 from scrapling.engines.toolbelt.fingerprints import generate_convincing_referer
@@ -78,7 +78,7 @@ class StealthySession(SyncSession, StealthySessionMixin):
         self.__validate__(**kwargs)
         super().__init__()
 
-    def start(self):
+    def start(self) -> None:
         """Create a browser for this instance and context."""
         if not self.playwright:
             self.playwright = sync_playwright().start()
@@ -146,7 +146,7 @@ class StealthySession(SyncSession, StealthySessionMixin):
                         # Waiting for the verify spinner to disappear, checking every 1s if it disappeared
                         page.wait_for_timeout(500)
 
-                outer_box = {}
+                outer_box: Any = {}
                 iframe = page.frame(url=__CF_PATTERN__)
                 if iframe is not None:
                     self._wait_for_page_stability(iframe, True, False)
@@ -156,14 +156,14 @@ class StealthySession(SyncSession, StealthySessionMixin):
                             # Double-checking that the iframe is loaded
                             page.wait_for_timeout(500)
 
-                    outer_box: Any = iframe.frame_element().bounding_box()
+                    outer_box = iframe.frame_element().bounding_box()
 
                 if not iframe or not outer_box:
                     if "<title>Just a moment...</title>" not in (ResponseFactory._get_page_content(page)):
                         log.info("Cloudflare captcha is solved")
                         return
 
-                    outer_box: Any = page.locator(box_selector).last.bounding_box()
+                    outer_box = page.locator(box_selector).last.bounding_box()
 
                 # Calculate the Captcha coordinates for any viewport
                 captcha_x, captcha_y = outer_box["x"] + randint(26, 28), outer_box["y"] + randint(25, 27)
@@ -223,6 +223,7 @@ class StealthySession(SyncSession, StealthySessionMixin):
         )
 
         for attempt in range(self._config.retries):
+            proxy: Optional[ProxyType] = None
             if self._config.proxy_rotator and static_proxy is None:
                 proxy = self._config.proxy_rotator.get_proxy()
             else:
@@ -335,7 +336,7 @@ class AsyncStealthySession(AsyncSession, StealthySessionMixin):
         self.__validate__(**kwargs)
         super().__init__(max_pages=self._config.max_pages)
 
-    async def start(self):
+    async def start(self) -> None:
         """Create a browser for this instance and context."""
         if not self.playwright:
             self.playwright = await async_playwright().start()
@@ -344,16 +345,14 @@ class AsyncStealthySession(AsyncSession, StealthySessionMixin):
                     self.browser = await self.playwright.chromium.connect_over_cdp(endpoint_url=self._config.cdp_url)
                     if not self._config.proxy_rotator:
                         assert self.browser is not None
-                        self.context: AsyncBrowserContext = await self.browser.new_context(**self._context_options)
+                        self.context = await self.browser.new_context(**self._context_options)
                 elif self._config.proxy_rotator:
                     self.browser = await self.playwright.chromium.launch(**self._browser_options)
                 else:
                     persistent_options = (
                         self._browser_options | self._context_options | {"user_data_dir": self._user_data_dir}
                     )
-                    self.context: AsyncBrowserContext = await self.playwright.chromium.launch_persistent_context(
-                        **persistent_options
-                    )
+                    self.context = await self.playwright.chromium.launch_persistent_context(**persistent_options)
 
                 if self.context:
                     self.context = await self._initialize_context(self._config, self.context)
@@ -367,7 +366,7 @@ class AsyncStealthySession(AsyncSession, StealthySessionMixin):
         else:
             raise RuntimeError("Session has been already started")
 
-    async def _initialize_context(self, config, ctx: AsyncBrowserContext) -> AsyncBrowserContext:
+    async def _initialize_context(self, config: Any, ctx: AsyncBrowserContext) -> AsyncBrowserContext:
         """Initialize the browser context."""
         for script in _compiled_stealth_scripts():
             await ctx.add_init_script(script=script)
@@ -404,7 +403,7 @@ class AsyncStealthySession(AsyncSession, StealthySessionMixin):
                         # Waiting for the verify spinner to disappear, checking every 1s if it disappeared
                         await page.wait_for_timeout(500)
 
-                outer_box = {}
+                outer_box: Any = {}
                 iframe = page.frame(url=__CF_PATTERN__)
                 if iframe is not None:
                     await self._wait_for_page_stability(iframe, True, False)
@@ -414,14 +413,14 @@ class AsyncStealthySession(AsyncSession, StealthySessionMixin):
                             # Double-checking that the iframe is loaded
                             await page.wait_for_timeout(500)
 
-                    outer_box: Any = await (await iframe.frame_element()).bounding_box()
+                    outer_box = await (await iframe.frame_element()).bounding_box()
 
                 if not iframe or not outer_box:
                     if "<title>Just a moment...</title>" not in (await ResponseFactory._get_async_page_content(page)):
                         log.info("Cloudflare captcha is solved")
                         return
 
-                    outer_box: Any = await page.locator(box_selector).last.bounding_box()
+                    outer_box = await page.locator(box_selector).last.bounding_box()
 
                 # Calculate the Captcha coordinates for any viewport
                 captcha_x, captcha_y = outer_box["x"] + randint(26, 28), outer_box["y"] + randint(25, 27)
@@ -482,6 +481,7 @@ class AsyncStealthySession(AsyncSession, StealthySessionMixin):
         )
 
         for attempt in range(self._config.retries):
+            proxy: Optional[ProxyType] = None
             if self._config.proxy_rotator and static_proxy is None:
                 proxy = self._config.proxy_rotator.get_proxy()
             else:
diff --git a/scrapling/engines/_browsers/_validators.py b/scrapling/engines/_browsers/_validators.py
index af2baef..e2424f4 100644
--- a/scrapling/engines/_browsers/_validators.py
+++ b/scrapling/engines/_browsers/_validators.py
@@ -157,15 +157,16 @@ def validate_fetch(
     session: Any,
     model: type[PlaywrightConfig] | type[StealthConfig],
 ) -> _fetch_params:  # pragma: no cover
-    result = {}
-    overrides = {}
+    result: Dict[str, Any] = {}
+    overrides: Dict[str, Any] = {}
+    kwargs_dict: Dict[str, Any] = dict(method_kwargs)
 
     # Get all field names that _fetch_params needs
     fetch_param_fields = {f.name for f in fields(_fetch_params)}
 
     for key in fetch_param_fields:
-        if key in method_kwargs:
-            overrides[key] = method_kwargs[key]
+        if key in kwargs_dict:
+            overrides[key] = kwargs_dict[key]
         elif hasattr(session, "_config") and hasattr(session._config, key):
             result[key] = getattr(session._config, key)
 
diff --git a/scrapling/engines/static.py b/scrapling/engines/static.py
index 884fe0c..204c105 100644
--- a/scrapling/engines/static.py
+++ b/scrapling/engines/static.py
@@ -753,7 +753,7 @@ class FetcherSession:
 class FetcherClient(_SyncSessionLogic):
     __slots__ = ("__enter__", "__exit__")
 
-    def __init__(self, **kwargs):
+    def __init__(self, **kwargs: Any) -> None:
         super().__init__(**kwargs)
         self.__enter__: Any = None
         self.__exit__: Any = None
@@ -763,7 +763,7 @@ class FetcherClient(_SyncSessionLogic):
 class AsyncFetcherClient(_ASyncSessionLogic):
     __slots__ = ("__aenter__", "__aexit__")
 
-    def __init__(self, **kwargs):
+    def __init__(self, **kwargs: Any) -> None:
         super().__init__(**kwargs)
         self.__aenter__: Any = None
         self.__aexit__: Any = None
diff --git a/scrapling/engines/toolbelt/convertor.py b/scrapling/engines/toolbelt/convertor.py
index 4b4caa2..1a8d799 100644
--- a/scrapling/engines/toolbelt/convertor.py
+++ b/scrapling/engines/toolbelt/convertor.py
@@ -38,7 +38,7 @@ class ResponseFactory:
     @classmethod
     def _process_response_history(cls, first_response: SyncResponse, parser_arguments: Dict) -> list[Response]:
         """Process response history to build a list of `Response` objects"""
-        history = []
+        history: list[Response] = []
         current_request = first_response.request.redirected_from
 
         try:
@@ -101,6 +101,7 @@ class ResponseFactory:
         :param first_response: An earlier or initial Playwright `Response` object that may serve as a fallback response in the absence of the final one.
         :param parser_arguments: A dictionary containing additional arguments needed for parsing or further customization of the returned `Response`. These arguments are dynamically unpacked into
             the `Response` object.
+        :param meta: Additional meta data to be saved with the response.
 
         :return: A fully populated `Response` object containing the page's URL, content, status, headers, cookies, and other derived metadata.
         :rtype: Response
@@ -145,7 +146,7 @@ class ResponseFactory:
         cls, first_response: AsyncResponse, parser_arguments: Dict
     ) -> list[Response]:
         """Process response history to build a list of `Response` objects"""
-        history = []
+        history: list[Response] = []
         current_request = first_response.request.redirected_from
 
         try:
@@ -238,6 +239,7 @@ class ResponseFactory:
         :param first_response: An earlier or initial Playwright `Response` object that may serve as a fallback response in the absence of the final one.
         :param parser_arguments: A dictionary containing additional arguments needed for parsing or further customization of the returned `Response`. These arguments are dynamically unpacked into
             the `Response` object.
+        :param meta: Additional meta data to be saved with the response.
 
         :return: A fully populated `Response` object containing the page's URL, content, status, headers, cookies, and other derived metadata.
         :rtype: Response
diff --git a/scrapling/parser.py b/scrapling/parser.py
index 1ae6db1..820bc71 100644
--- a/scrapling/parser.py
+++ b/scrapling/parser.py
@@ -118,8 +118,11 @@ class Selector(SelectorsGeneration):
         if root is None and content is None:
             raise ValueError("Selector class needs HTML content, or root arguments to work")
 
-        self.__text = None
+        self.__text: Optional[TextHandler] = None
+        self.__tag: Optional[str] = None
+        self.__attributes: Optional[AttributesHandler] = None
         if root is None:
+            body: str | bytes
             if isinstance(content, str):
                 body = content.strip().replace("\x00", "") or "<html/>"
             elif isinstance(content, bytes):
@@ -128,17 +131,18 @@ class Selector(SelectorsGeneration):
                 raise TypeError(f"content argument must be str or bytes, got {type(content)}")
 
             # https://lxml.de/api/lxml.etree.HTMLParser-class.html
-            parser = HTMLParser(
+            _parser_kwargs: Dict[str, Any] = dict(
                 recover=True,
                 remove_blank_text=True,
                 remove_comments=(not keep_comments),
                 encoding=encoding,
                 compact=True,
                 huge_tree=huge_tree,
-                default_doctype=True,
+                default_doctype=True,  # Supported by lxml but missing from stubs
                 strip_cdata=(not keep_cdata),
             )
-            self._root = cast(HtmlElement, fromstring(body or "<html/>", parser=parser, base_url=url or None))
+            parser = HTMLParser(**_parser_kwargs)
+            self._root = cast(HtmlElement, fromstring(body or "<html/>", parser=parser, base_url=url or ""))
             self._raw_body = content
 
         else:
@@ -164,7 +168,7 @@ class Selector(SelectorsGeneration):
             self._root = cast(HtmlElement, root)
             self._raw_body = ""
 
-        self.__adaptive_enabled = adaptive
+        self.__adaptive_enabled = bool(adaptive)
 
         if self.__adaptive_enabled:
             if _storage is not None:
@@ -277,8 +281,8 @@ class Selector(SelectorsGeneration):
         if self._is_text_node(self._root):
             return "#text"
         if not self.__tag:
-            self.__tag = self._root.tag
-        return self.__tag
+            self.__tag = str(self._root.tag)
+        return self.__tag or ""
 
     @property
     def text(self) -> TextHandler:
@@ -313,11 +317,11 @@ class Selector(SelectorsGeneration):
         if self._is_text_node(self._root):
             return TextHandler(str(self._root))
 
-        ignored_elements = set()
+        ignored_elements: set[Any] = set()
         if ignore_tags:
             for element in self._root.iter(*ignore_tags):
                 ignored_elements.add(element)
-                ignored_elements.update(set(_find_all_elements(element)))
+                ignored_elements.update(cast(list, _find_all_elements(element)))
 
         _all_strings = []
         for node in self._root.iter():
@@ -395,7 +399,7 @@ class Selector(SelectorsGeneration):
         """Return all elements under the current element in the DOM tree"""
         if self._is_text_node(self._root):
             return Selectors()
-        below = _find_all_elements(self._root)
+        below = cast(List, _find_all_elements(self._root))
         return self.__elements_convertor(below) if below is not None else Selectors()
 
     @property
@@ -533,7 +537,7 @@ class Selector(SelectorsGeneration):
         :param selector_type: If True, the return result will be converted to `Selectors` object
         :return: List of pure HTML elements that got the highest matching score or 'Selectors' object
         """
-        score_table = {}
+        score_table: Dict[float, List[Any]] = {}
         # Note: `element` will most likely always be a dictionary at this point.
         if isinstance(element, self.__class__):
             element = element._root
@@ -541,11 +545,11 @@ class Selector(SelectorsGeneration):
         if issubclass(type(element), HtmlElement):
             element = _StorageTools.element_to_dict(element)
 
-        for node in _find_all_elements(self._root):
+        for node in cast(List, _find_all_elements(self._root)):
             # Collect all elements in the page, then for each element get the matching score of it against the node.
             # Hence: the code doesn't stop even if the score was 100%
             # because there might be another element(s) left in page with the same score
-            score = self.__calculate_similarity_score(element, node)
+            score = self.__calculate_similarity_score(cast(Dict, element), node)
             score_table.setdefault(score, []).append(node)
 
         if score_table:
@@ -710,7 +714,7 @@ class Selector(SelectorsGeneration):
         if not args and not kwargs:
             raise TypeError("You have to pass something to search with, like tag name(s), tag attributes, or both.")
 
-        attributes = dict()
+        attributes: Dict[str, Any] = dict()
         tags: Set[str] = set()
         patterns: Set[Pattern] = set()
         results, functions, selectors = Selectors(), [], []
@@ -809,21 +813,19 @@ class Selector(SelectorsGeneration):
         :param candidate: The element to compare with the original element.
         :return: A percentage score of how similar is the candidate to the original element
         """
-        score, checks = 0, 0
+        score: float = 0
+        checks: int = 0
         data = _StorageTools.element_to_dict(candidate)
 
-        # Possible TODO:
-        # Study the idea of giving weight to each test below so some are more important than others
-        # Current results: With weights some websites had better score while it was worse for others
-        score += 1 if original["tag"] == data["tag"] else 0  # * 0.3  # 30%
+        score += 1 if original["tag"] == data["tag"] else 0
         checks += 1
 
         if original["text"]:
-            score += SequenceMatcher(None, original["text"], data.get("text") or "").ratio()  # * 0.3  # 30%
+            score += SequenceMatcher(None, original["text"], data.get("text") or "").ratio()
             checks += 1
 
         # if both don't have attributes, it still counts for something!
-        score += self.__calculate_dict_diff(original["attributes"], data["attributes"])  # * 0.3  # 30%
+        score += self.__calculate_dict_diff(original["attributes"], data["attributes"])
         checks += 1
 
         # Separate similarity test for class, id, href,... this will help in full structural changes
@@ -838,23 +840,19 @@ class Selector(SelectorsGeneration):
                     None,
                     original["attributes"][attrib],
                     data["attributes"].get(attrib) or "",
-                ).ratio()  # * 0.3  # 30%
+                ).ratio()
                 checks += 1
 
-        score += SequenceMatcher(None, original["path"], data["path"]).ratio()  # * 0.1  # 10%
+        score += SequenceMatcher(None, original["path"], data["path"]).ratio()
         checks += 1
 
         if original.get("parent_name"):
             # Then we start comparing parents' data
             if data.get("parent_name"):
-                score += SequenceMatcher(
-                    None, original["parent_name"], data.get("parent_name") or ""
-                ).ratio()  # * 0.2  # 20%
+                score += SequenceMatcher(None, original["parent_name"], data.get("parent_name") or "").ratio()
                 checks += 1
 
-                score += self.__calculate_dict_diff(
-                    original["parent_attribs"], data.get("parent_attribs") or {}
-                )  # * 0.2  # 20%
+                score += self.__calculate_dict_diff(original["parent_attribs"], data.get("parent_attribs") or {})
                 checks += 1
 
                 if original["parent_text"]:
@@ -862,14 +860,14 @@ class Selector(SelectorsGeneration):
                         None,
                         original["parent_text"],
                         data.get("parent_text") or "",
-                    ).ratio()  # * 0.1  # 10%
+                    ).ratio()
                     checks += 1
             # else:
             #     # The original element has a parent and this one not, this is not a good sign
             #     score -= 0.1
 
         if original.get("siblings"):
-            score += SequenceMatcher(None, original["siblings"], data.get("siblings") or []).ratio()  # * 0.1  # 10%
+            score += SequenceMatcher(None, original["siblings"], data.get("siblings") or []).ratio()
             checks += 1
 
         # How % sure? let's see
@@ -890,14 +888,14 @@ class Selector(SelectorsGeneration):
             the docs for more info.
         """
         if self.__adaptive_enabled:
-            target = element
-            if isinstance(target, self.__class__):
-                target: HtmlElement = target._root
+            target_element: Any = element
+            if isinstance(target_element, self.__class__):
+                target_element = target_element._root
 
-            if self._is_text_node(target):
-                target: HtmlElement = target.getparent()
+            if self._is_text_node(target_element):
+                target_element = target_element.getparent()
 
-            self._storage.save(target, identifier)
+            self._storage.save(target_element, identifier)
         else:
             raise RuntimeError(
                 "Can't use `adaptive` features while it's disabled globally, you have to start a new class instance."
@@ -987,7 +985,8 @@ class Selector(SelectorsGeneration):
         candidate_attributes = (
             self.__get_attributes(candidate, ignore_attributes) if ignore_attributes else candidate.attrib
         )
-        score, checks = 0, 0
+        score: float = 0
+        checks: int = 0
 
         if original_attributes:
             score += sum(
@@ -1116,16 +1115,16 @@ class Selector(SelectorsGeneration):
         if not case_sensitive:
             text = text.lower()
 
-        possible_targets = _find_all_elements_with_spaces(self._root)
+        possible_targets = cast(List, _find_all_elements_with_spaces(self._root))
         if possible_targets:
             for node in self.__elements_convertor(possible_targets):
                 """Check if element matches given text otherwise, traverse the children tree and iterate"""
-                node_text = node.text
+                node_text: TextHandler = node.text
                 if clean_match:
-                    node_text = node_text.clean()
+                    node_text = TextHandler(node_text.clean())
 
                 if not case_sensitive:
-                    node_text = node_text.lower()
+                    node_text = TextHandler(node_text.lower())
 
                 if partial:
                     if text in node_text:
@@ -1178,7 +1177,7 @@ class Selector(SelectorsGeneration):
 
         results = Selectors()
 
-        possible_targets = _find_all_elements_with_spaces(self._root)
+        possible_targets = cast(List, _find_all_elements_with_spaces(self._root))
         if possible_targets:
             for node in self.__elements_convertor(possible_targets):
                 """Check if element matches given regex otherwise, traverse the children tree and iterate"""
diff --git a/scrapling/spiders/request.py b/scrapling/spiders/request.py
index 3351100..edfc387 100644
--- a/scrapling/spiders/request.py
+++ b/scrapling/spiders/request.py
@@ -7,7 +7,7 @@ import orjson
 from w3lib.url import canonicalize_url
 
 from scrapling.engines.toolbelt.custom import Response
-from scrapling.core._types import Any, AsyncGenerator, Callable, Dict, Union, Tuple, TYPE_CHECKING
+from scrapling.core._types import Any, AsyncGenerator, Callable, Dict, Optional, Union, Tuple, TYPE_CHECKING
 
 if TYPE_CHECKING:
     from scrapling.spiders.spider import Spider
@@ -42,7 +42,7 @@ class Request:
         self.meta: dict[str, Any] = meta if meta else {}
         self._retry_count: int = _retry_count
         self._session_kwargs = kwargs if kwargs else {}
-        self._fp = None
+        self._fp: Optional[bytes] = None
 
     def copy(self) -> "Request":
         """Create a copy of this request."""
@@ -89,7 +89,7 @@ class Request:
                 body = b""
         else:
             post_data = self._session_kwargs.get("json", {})
-            body: bytes = orjson.dumps(post_data) if post_data else b""
+            body = orjson.dumps(post_data) if post_data else b""
 
         data: Dict[str, str | Tuple] = {
             "sid": self.sid,
diff --git a/scrapling/spiders/session.py b/scrapling/spiders/session.py
index 8f5e7af..cc07042 100644
--- a/scrapling/spiders/session.py
+++ b/scrapling/spiders/session.py
@@ -12,7 +12,7 @@ Session = FetcherSession | AsyncDynamicSession | AsyncStealthySession
 class SessionManager:
     """Manages pre-configured session instances."""
 
-    def __init__(self):
+    def __init__(self) -> None:
         self._sessions: dict[str, Session] = {}
         self._default_session_id: str | None = None
         self._started: bool = False
@@ -109,17 +109,17 @@ class SessionManager:
                         await session.__aenter__()
 
             if isinstance(session, FetcherSession):
-                session = session._client
+                client = session._client
 
-                if isinstance(session, _ASyncSessionLogic):
-                    response = await session._make_request(
+                if isinstance(client, _ASyncSessionLogic):
+                    response = await client._make_request(
                         method=cast(SUPPORTED_HTTP_METHODS, request._session_kwargs.pop("method", "GET")),
                         url=request.url,
                         **request._session_kwargs,
                     )
                 else:
                     # Sync session or other types - shouldn't happen in async context
-                    raise TypeError(f"Session type {type(session)} not supported for async fetch")
+                    raise TypeError(f"Session type {type(client)} not supported for async fetch")
             else:
                 response = await session.fetch(url=request.url, **request._session_kwargs)