lib: Make sure that instance of mutate
gets a unique id for each instate, fix #4218
#4221
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This is then used to check that mutations are performed within the same
instate
call, i.e., we cannot hide a mutation by just temporarily instating the correspondingmutate
effect.Also add a regression test and fix the strange behavior of
fuzion.sys.misc.uniq_id
with the JVM backend.This currently breaks some code using
io.buffered.write
that needs to be checked.