rust: mostly avoid streaming zstd decompression
Streaming ZStd decompression seems slightly slower, and
the API we use makes it very inconvenient to re-use the
decompression context.
Instead of using that, use the buffer-backed version,
because we can give a reasonable-ish size estimate.
class VersionInfo:
@property
def year(self) -> int: ...
@property
def minor(self) -> int: ...
@property
def micro(self) -> int: ...
@property
def releaselevel(self) -> str: ...