match: add match.ispartial() match.ispartial() will return the opposite of match.always() in core, but this function will be extensible by extensions to produce another result even if match.always() will be untouched. This will be useful for narrowhg, where ispartial() will return False even if the match won't always match. This would happen in the case where the only time the match function is False is when the path is outside of the narrow spec.