Repository.resolve_refish can return a Tag, violates docstring and typehint

The typing hint and docstring of Repository.resolve_refish says it returns a Commit object. Actually, it will return a Tag object if given a tag's hex oid. Is this the expected behavior.

For example, in the Linux kernel:

assert pygit2.__version__ == "1.18.0"

# OID of `v6.12.1^{tag}` and v6.12.1^{commit}` in Linux kernel.                 
tag_oid = Oid(hex="a554dea023a451ad985c071f8aae6415f0e274df")   
commit_oid = Oid(hex="d390303b28dabbb91b2d32016a4f72da478733b9")
                                                                
# As documented, symbolic refs resolve to a commit object.
# But the ref target differs from the returned object. Is this the desired behavior?
obj, ref = repo.resolve_refish("v6.12.1")             
assert isinstance(obj, Commit)                                  
assert ref.target != obj.id
assert ref.target == tag_oid                               

# Contrary to the docstring and typing hint, this returns a Tag object.                                                                
obj, ref = repo.resolve_refish(str(tag_oid))                    
assert isinstance(obj, Tag)                                     
assert ref is None

Start at the Repository.resolve_refish entry point and inspect how symbolic references and direct object IDs are resolved. Look for existing tests covering Commit, Tag, and ref targets, then confirm the intended return contract with the maintainers. Done means the documented and typed behavior matches the verified behavior, with regression coverage for the two examples.