Am 17.12.20 um 14:25 schrieb Daniel Kinzler:
My original proposal was to change the signature of getId() to getId( $wikiId = false ), to assert that the PageIdentity actually belongs to the wiki the caller expects.
I made a patch exploring that option: https://gerrit.wikimedia.org/r/c/mediawiki/core/+/650126. https://gerrit.wikimedia.org/r/c/mediawiki/core/+/650126
It's much simpler, but it relies on runtime assertions rather than type hints.