Imagine that you discover a fork condition between V1 and V2 of bitcoin core.
Surely enough, this should be reported to github, and test data must be updated.

However, I think an even better action is to deliberately provoke the fork.
Since the damage a fork would provoke depends on the number of people being on the wrong side of the fork, I think it is better to provoke the fork sooner than later on buggy implementations.

Another reason to deliberately provoke it, is that would-be full node implementers (people that would not want to depends on bitcoin core) would be notified immediately about their bad implementation, and will not leave it unaddressed.

What do you think ?