rust-dirstatemap: add `set_cached_mtime` helper method
This will help remove the `get_or_insert` method, which is dangerous because it
does not take the `DirstateMap` counters into account
Differential Revision: https://phab.mercurial-scm.org/D12526
from typing import (
List,
)
version: int
class mpatchError(Exception): ...
def patches(text: bytes, bins: List[bytes]) -> bytes: ...
def patchedsize(orig: int, data: bytes) -> int: ...