diff --git a/stdlib/asyncio/unix_events.pyi b/stdlib/asyncio/unix_events.pyi
index 54a2a039749e..368cac38302f 100644
--- a/stdlib/asyncio/unix_events.pyi
+++ b/stdlib/asyncio/unix_events.pyi
@@ -95,6 +95,7 @@ if sys.platform != "win32":
         if sys.version_info >= (3, 12):
             # Doesn't actually have ABCMeta metaclass at runtime, but mypy complains if we don't have it in the stub.
             # See discussion in #7412
+            @deprecated("Deprecated since Python 3.12; removed in Python 3.14.")
             class BaseChildWatcher(AbstractChildWatcher, metaclass=ABCMeta):
                 def close(self) -> None: ...
                 def is_active(self) -> bool: ...
diff --git a/stdlib/multiprocessing/context.pyi b/stdlib/multiprocessing/context.pyi
index a802d1e235e5..903acf158e55 100644
--- a/stdlib/multiprocessing/context.pyi
+++ b/stdlib/multiprocessing/context.pyi
@@ -124,25 +124,18 @@ class BaseContext:
     def allow_connection_pickling(self) -> None: ...
     def set_executable(self, executable: str) -> None: ...
     def set_forkserver_preload(self, module_names: list[str]) -> None: ...
+    @overload
+    def get_context(self, method: None = None) -> DefaultContext: ...
+    @overload
+    def get_context(self, method: Literal["spawn"]) -> SpawnContext: ...
     if sys.platform != "win32":
-        @overload
-        def get_context(self, method: None = None) -> DefaultContext: ...
-        @overload
-        def get_context(self, method: Literal["spawn"]) -> SpawnContext: ...
         @overload
         def get_context(self, method: Literal["fork"]) -> ForkContext: ...
         @overload
         def get_context(self, method: Literal["forkserver"]) -> ForkServerContext: ...
-        @overload
-        def get_context(self, method: str) -> BaseContext: ...
-    else:
-        @overload
-        def get_context(self, method: None = None) -> DefaultContext: ...
-        @overload
-        def get_context(self, method: Literal["spawn"]) -> SpawnContext: ...
-        @overload
-        def get_context(self, method: str) -> BaseContext: ...
 
+    @overload
+    def get_context(self, method: str) -> BaseContext: ...
     @overload
     def get_start_method(self, allow_none: Literal[False] = False) -> str: ...
     @overload
diff --git a/stdlib/tarfile.pyi b/stdlib/tarfile.pyi
index 9bc738c9fd7b..a046fa3e4e1f 100644
--- a/stdlib/tarfile.pyi
+++ b/stdlib/tarfile.pyi
@@ -132,8 +132,9 @@ class TarFile:
     errorlevel: Literal[0, 1, 2]
     offset: int  # undocumented
     extraction_filter: _FilterFunction | None
-    if sys.version_info >= (3, 15):
+    if sys.version_info >= (3, 13):
         stream: bool
+    if sys.version_info >= (3, 15):
         def __init__(
             self,
             name: StrOrBytesPath | None = None,
@@ -153,7 +154,6 @@ class TarFile:
             mtime: float | None = None,
         ) -> None: ...
     elif sys.version_info >= (3, 13):
-        stream: bool
         def __init__(
             self,
             name: StrOrBytesPath | None = None,
diff --git a/stubs/pyserial/serial/serialposix.pyi b/stubs/pyserial/serial/serialposix.pyi
index 84f84c9e1614..2313419ca368 100644
--- a/stubs/pyserial/serial/serialposix.pyi
+++ b/stubs/pyserial/serial/serialposix.pyi
@@ -20,12 +20,7 @@ if sys.platform == "linux":
     SER_RS485_RTS_AFTER_SEND: int
     SER_RS485_RX_DURING_TX: int
 
-    class PlatformSpecific(PlatformSpecificBase): ...
-
-elif sys.platform == "cygwin":
-    class PlatformSpecific(PlatformSpecificBase): ...
-
-elif sys.platform == "darwin":
+if sys.platform == "darwin":
     IOSSIOSPEED: int
 
     class PlatformSpecific(PlatformSpecificBase):