Directly return attributes.

Co-authored-by: Ronny Pfannschmidt <[email protected]>

Author: jaraco

importlib_metadata/__init__.py

@@ -204,7 +204,7 @@ def matches(self, **params):
         return all(map(operator.eq, params.values(), attrs))
 
     def _key(self):
-        return tuple(getattr(self, key) for key in 'name value group'.split())
+        return self.name, self.value, self.group
 
     def __lt__(self, other):
         return self._key() < other._key()