Repo.get_walker confused about type of SHA

[sattlerc]

This makes it seem str is expected, but in fact

repo.get_walker(include = '0' * 40)

results in:

AttributeError: 'str' object has no attribute 'decode'

[sattlerc]

Note that Walker.__init__ already has this:

        if isinstance(include, bytes):
            # TODO(jelmer): Really, this should require a single type.
            # Print deprecation warning here?
            include = [include]

So presumably this can just be deleted.

[jelmer]

object ids are always bytestrings in Dulwich

The line you're referencing is a remnant from when Dulwich supported Python 2; I've create a PR to remove it. Thanks!