AliasResolutionError when checking project

[pawamoy]

Describe the bug
The Breakage class and subclasses use self.obj.filepath, which can trigger an alias resolution error.

To Reproduce

pipx install griffe
git clone https://github.com/pawamoy/duty
cd duty
griffe check duty -ssrc -a 0.9.0

Expected behavior
Aliases should be supported without error.
src/duty/callables/__init__.py:31: lazy: Public object points to a different kind of object: function -> alias

Additional context
The detected breaking change is a false positive by the way.