Too many crashes found by fuzzing #339
Description
I procrastinated from writing the builder (that I promised to restart writing in 2022 for the third time) by fixing all P1s, and the last remaining one was the lack of fuzzing target, that I've added in 209fbb6.
That trivial piece of code and some assistance from HonggFuzz uncovered a giant pile of crashes that I will use this issue to discuss and fix.