Function prototype localization continued.

Internal optimization of such localization proceeds apace, agape with
efficiently determinism-striated stridency.
Function prototype localization continued.

In preparation for the inevitable crash-and-burn of a trial run, variable type
tester nomenclature has been fundamentally revised (e.g., from :is_var_int() to
:int:is()). We hope this not to be the trap-laden precipice it augers.