If you something like:
You get a fatal (and non-sensical) error. While the above example is kinda ridiculous, it was found because a plugin wants to mark standard field as required, and we were changing the standard field to be required.
This should do one of these:
- Be silent. (Probably just ignore the second rule)
- Throw a dev warning.
- Throw a sensical fatal message.
I probably vote for number 2.