Hammer had been accessing dangling pointers under particular circumstances (e.g. when hitting a mine/barrel right when it exploded)
Hammer changes/fixes: honor extra-damage (
issue #975), round up damage, do correct damage when being spammed in infinite-attack mode
oops. melon pieces need friction and elasticity to bounce right.
Fixes to 10760 to reduce desyncs on checkers and better heat my room during long dark winter nights