Added missing variable
Revert "Changed fast_call_threads_etc handling with valgrind"

This reverts commit 1c4cf54199bd51903bc071a5aceff11e40c00222.

Needs more work, currently it is causing crashes.
More compact type checks, no need to do a cmp, & is enough now.
Mappings: Fixed assertion.

Ensure that there are at least as many keypairs as buckets in
created mappings.

Fixes fatal "Pretty mean hashtable there buster!".