Maybe it's not that important... but it seems that these two functions do exactly the same thing.

The only difference is that getAncestor is a type guard as well.

What should be done? Options

1. Modify the return type of $findMatchingParent so that it is also a type guard, and make one function call the other, but leave both to avoid a breaking change.
2. Delete one of the two functions. In case of removing getAncestor make $findMatchingParent a type guard.