This is somewhat tricky to implement because path equality is not
straightforward. See
https://github.com/abseil/abseil-cpp/pull/1560#issuecomment-1799983471
for discussion.

Closes #655
Closes #1560

PiperOrigin-RevId: 582863821
Change-Id: I03517a7f2003614c027c786abbfb91b6571ab662