diff --git a/pathspec/pathspec.py b/pathspec/pathspec.py
index bb88cbf..7c99b1c 100644
--- a/pathspec/pathspec.py
+++ b/pathspec/pathspec.py
@@ -98,13 +98,13 @@ def __init__(
 		contains the compiled patterns.
 		"""
 
-	def __add__(self: Self, other: PathSpec) -> Self:
+	def __add__(self: Self, other: object) -> Self:
 		"""
 		Combines the :attr:`self.patterns <.PathSpec.patterns>` patterns from two
 		:class:`PathSpec` instances.
 		"""
 		if isinstance(other, PathSpec):
-			return self.__class__(self.patterns + other.patterns, backend=self._backend_name)
+			return self.__class__([*self.patterns, *other.patterns], backend=self._backend_name)
 		else:
 			return NotImplemented
 
@@ -119,7 +119,7 @@ def __eq__(self, other: object) -> bool:
 		else:
 			return NotImplemented
 
-	def __iadd__(self: Self, other: PathSpec) -> Self:
+	def __iadd__(self: Self, other: object) -> Self:
 		"""
 		Adds the :attr:`self.patterns <.PathSpec.patterns>` from *other*
 		(:class:`PathSpec`) to this instance.
diff --git a/pathspec/pattern.py b/pathspec/pattern.py
index a4b8a2c..351af78 100644
--- a/pathspec/pattern.py
+++ b/pathspec/pattern.py
@@ -168,7 +168,7 @@ def __copy__(self: RegexPatternSelf) -> RegexPatternSelf:
 		other.pattern = self.pattern
 		return other
 
-	def __eq__(self, other: RegexPattern) -> bool:
+	def __eq__(self, other: object) -> bool:
 		"""
 		Tests the equality of this regex pattern with *other* (:class:`RegexPattern`)
 		by comparing their :attr:`~Pattern.include` and :attr:`~RegexPattern.regex`
diff --git a/pathspec/util.py b/pathspec/util.py
index ea2dbee..9a3f2c1 100644
--- a/pathspec/util.py
+++ b/pathspec/util.py
@@ -146,10 +146,11 @@ def detailed_match_files(
 				# Add files and record pattern.
 				for result_file in result_files:
 					if result_file in return_files:
+						# We know here that .patterns is a list, becasue we made it here
 						if all_matches:
-							return_files[result_file].patterns.append(pattern)
+							return_files[result_file].patterns.append(pattern) # type: ignore[attr-defined]
 						else:
-							return_files[result_file].patterns[0] = pattern
+							return_files[result_file].patterns[0] = pattern  # type: ignore[index]
 					else:
 						return_files[result_file] = MatchDetail([pattern])