ENHANCED: support full layout text sequence (also comments) in integers with underscores
ENHANCED: support full layout text sequence (also comments) in integers with underscores

Example:

    ?- X = 1_/**/2.
    %@    X = 12.

Following the comment in https://github.com/mthom/scryer-prolog/pull/1112#issuecomment-981540485

mthom/rusty-wam