interfaces: introduce and use a protocol class for the `base85` module See f2832de2a46c for details when this was done for the `bdiff` module. It looks like PEP-688 removed the special casing of `bytes` being a standin for any type of `ByteString`, and defines a `typing.Buffer` class (with a backport in `typing_extensions` for Python prior to 3.12). There's been a lot of churn in this area with pytype, but recent versions of pytype and PyCharm recognize this, and e.g. have `mercurial.node.hex()` defined as: from typing_extensions import Buffer def hex(data: Buffer, sep: str | bytes = ..., bytes_per_sep: int = ...) -> bytes This covers `bytes`, `bytearray`, and `memoryview` by default. Both of the C functions here use `y#` to parse the arguments, which means the arg is a byte-like object[2], so the args would appear to be better typed as `Buffer`. However, pytype has a bug that prevents using this from `typing_extensions`[3], and mypy complained `Unsupported left operand type for + ("memoryview")` in the pure module on line 37 (meaning it's only a subset of `Buffer`). So hold off on changing any of that for now. [1] https://peps.python.org/pep-0688/#no-special-meaning-for-bytes [2] https://docs.python.org/3/glossary.html#term-bytes-like-object [3] https://github.com/google/pytype/issues/1772

--- a/mercurial/util.py	Fri Oct 04 23:09:56 2024 -0400
+++ b/mercurial/util.py	Fri Oct 04 23:21:41 2024 -0400
@@ -70,6 +70,9 @@
     typelib,
     urllibcompat,
 )
+from .interfaces import (
+    modules as intmod,
+)
 from .utils import (
     compression,
     hashutil,
@@ -87,7 +90,7 @@
 ]
 
 
-base85 = policy.importmod('base85')
+base85: intmod.Base85 = policy.importmod('base85')
 osutil = policy.importmod('osutil')
 
 b85decode = base85.b85decode