add encodings.ascii and encodings.latin_1 (#13113)

stdlib/encodings/ascii.pyi

@@ -0,0 +1,30 @@
+import codecs
+from _typeshed import ReadableBuffer
+
+class Codec(codecs.Codec):
+    # At runtime, this is codecs.ascii_encode
+    @staticmethod
+    def encode(str: str, errors: str | None = None, /) -> tuple[bytes, int]: ...
+    # At runtime, this is codecs.ascii_decode
+    @staticmethod
+    def decode(data: ReadableBuffer, errors: str | None = None, /) -> tuple[str, int]: ...
+
+class IncrementalEncoder(codecs.IncrementalEncoder):
+    def encode(self, input: str, final: bool = False) -> bytes: ...
+
+class IncrementalDecoder(codecs.IncrementalDecoder):
+    def decode(self, input: ReadableBuffer, final: bool = False) -> str: ...
+
+class StreamWriter(Codec, codecs.StreamWriter): ...
+class StreamReader(Codec, codecs.StreamReader): ...
+
+# Note: encode being a decode function and decode being an encode function is accurate to runtime.
+class StreamConverter(StreamWriter, StreamReader):  # type: ignore[misc]  # incompatible methods in base classes
+    # At runtime, this is codecs.ascii_decode
+    @staticmethod
+    def encode(data: ReadableBuffer, errors: str | None = None, /) -> tuple[str, int]: ...  # type: ignore[override]
+    # At runtime, this is codecs.ascii_encode
+    @staticmethod
+    def decode(str: str, errors: str | None = None, /) -> tuple[bytes, int]: ...  # type: ignore[override]
+
+def getregentry() -> codecs.CodecInfo: ...