Add more defaults to the stdlib (#9606)

Continuing work towards #8988.

The first five commits were created using stubdefaulter on various Python versions; the following commits were all created manually by me to fix various problems. The main things this adds that weren't present in #9501 are:

- Defaults in Windows-only modules and Windows-only branches (because I'm running a Windows machine)
- Defaults in non-py311 branches
- Defaults for float parameters
- Defaults for overloads

stdlib/shutil.pyi

@@ -47,18 +47,18 @@ class ExecError(OSError): ...
 class ReadError(OSError): ...
 class RegistryError(Exception): ...
 
-def copyfileobj(fsrc: SupportsRead[AnyStr], fdst: SupportsWrite[AnyStr], length: int = 0) -> None: ...
+def copyfileobj(fsrc: SupportsRead[AnyStr], fdst: SupportsWrite[AnyStr], length: int = ...) -> None: ...
 def copyfile(src: StrOrBytesPath, dst: _StrOrBytesPathT, *, follow_symlinks: bool = True) -> _StrOrBytesPathT: ...
 def copymode(src: StrOrBytesPath, dst: StrOrBytesPath, *, follow_symlinks: bool = True) -> None: ...
 def copystat(src: StrOrBytesPath, dst: StrOrBytesPath, *, follow_symlinks: bool = True) -> None: ...
 @overload
-def copy(src: StrPath, dst: StrPath, *, follow_symlinks: bool = ...) -> _PathReturn: ...
+def copy(src: StrPath, dst: StrPath, *, follow_symlinks: bool = True) -> _PathReturn: ...
 @overload
-def copy(src: BytesPath, dst: BytesPath, *, follow_symlinks: bool = ...) -> _PathReturn: ...
+def copy(src: BytesPath, dst: BytesPath, *, follow_symlinks: bool = True) -> _PathReturn: ...
 @overload
-def copy2(src: StrPath, dst: StrPath, *, follow_symlinks: bool = ...) -> _PathReturn: ...
+def copy2(src: StrPath, dst: StrPath, *, follow_symlinks: bool = True) -> _PathReturn: ...
 @overload
-def copy2(src: BytesPath, dst: BytesPath, *, follow_symlinks: bool = ...) -> _PathReturn: ...
+def copy2(src: BytesPath, dst: BytesPath, *, follow_symlinks: bool = True) -> _PathReturn: ...
 def ignore_patterns(*patterns: StrPath) -> Callable[[Any, list[str]], set[str]]: ...
 
 if sys.version_info >= (3, 8):
@@ -76,10 +76,10 @@ else:
     def copytree(
         src: StrPath,
         dst: StrPath,
-        symlinks: bool = ...,
-        ignore: None | Callable[[str, list[str]], Iterable[str]] | Callable[[StrPath, list[str]], Iterable[str]] = ...,
+        symlinks: bool = False,
+        ignore: None | Callable[[str, list[str]], Iterable[str]] | Callable[[StrPath, list[str]], Iterable[str]] = None,
         copy_function: Callable[[str, str], object] = ...,
-        ignore_dangling_symlinks: bool = ...,
+        ignore_dangling_symlinks: bool = False,
     ) -> _PathReturn: ...
 
 _OnErrorCallback: TypeAlias = Callable[[Callable[..., Any], Any, Any], object]
@@ -124,9 +124,9 @@ def disk_usage(path: FileDescriptorOrPath) -> _ntuple_diskusage: ...
 # see https://bugs.python.org/issue33140. We keep it here because it's
 # in __all__.
 @overload
-def chown(path: StrOrBytesPath, user: str | int, group: None = ...) -> None: ...
+def chown(path: StrOrBytesPath, user: str | int, group: None = None) -> None: ...
 @overload
-def chown(path: StrOrBytesPath, user: None = ..., *, group: str | int) -> None: ...
+def chown(path: StrOrBytesPath, user: None = None, *, group: str | int) -> None: ...
 @overload
 def chown(path: StrOrBytesPath, user: None, group: str | int) -> None: ...
 @overload
@@ -134,12 +134,12 @@ def chown(path: StrOrBytesPath, user: str | int, group: str | int) -> None: ...
 
 if sys.version_info >= (3, 8):
     @overload
-    def which(cmd: _StrPathT, mode: int = ..., path: StrPath | None = ...) -> str | _StrPathT | None: ...
+    def which(cmd: _StrPathT, mode: int = 1, path: StrPath | None = None) -> str | _StrPathT | None: ...
     @overload
-    def which(cmd: bytes, mode: int = ..., path: StrPath | None = ...) -> bytes | None: ...
+    def which(cmd: bytes, mode: int = 1, path: StrPath | None = None) -> bytes | None: ...
 
 else:
-    def which(cmd: _StrPathT, mode: int = ..., path: StrPath | None = ...) -> str | _StrPathT | None: ...
+    def which(cmd: _StrPathT, mode: int = 1, path: StrPath | None = None) -> str | _StrPathT | None: ...
 
 def make_archive(
     base_name: str,
@@ -155,11 +155,11 @@ def make_archive(
 def get_archive_formats() -> list[tuple[str, str]]: ...
 @overload
 def register_archive_format(
-    name: str, function: Callable[..., object], extra_args: Sequence[tuple[str, Any] | list[Any]], description: str = ...
+    name: str, function: Callable[..., object], extra_args: Sequence[tuple[str, Any] | list[Any]], description: str = ""
 ) -> None: ...
 @overload
 def register_archive_format(
-    name: str, function: Callable[[str, str], object], extra_args: None = ..., description: str = ...
+    name: str, function: Callable[[str, str], object], extra_args: None = None, description: str = ""
 ) -> None: ...
 def unregister_archive_format(name: str) -> None: ...
 def unpack_archive(filename: StrPath, extract_dir: StrPath | None = None, format: str | None = None) -> None: ...
@@ -169,11 +169,11 @@ def register_unpack_format(
     extensions: list[str],
     function: Callable[..., object],
     extra_args: Sequence[tuple[str, Any]],
-    description: str = ...,
+    description: str = "",
 ) -> None: ...
 @overload
 def register_unpack_format(
-    name: str, extensions: list[str], function: Callable[[str, str], object], extra_args: None = ..., description: str = ...
+    name: str, extensions: list[str], function: Callable[[str, str], object], extra_args: None = None, description: str = ""
 ) -> None: ...
 def unregister_unpack_format(name: str) -> None: ...
 def get_unpack_formats() -> list[tuple[str, list[str], str]]: ...