Check for END in IS_* macros
Check for END in IS_* macros

VAL_TYPE does not work on END!

kealist/ren-c,draegtun/ren-c,draegtun/ren-c,giuliolunati/ren-c,kealist/ren-c,rgchris/ren-c,draegtun/ren-c,kealist/ren-c,hostilefork/rebol,draegtun/ren-c,rgchris/ren-c,kealist/ren-c,giuliolunati/ren-c,hostilefork/rebol,hostilefork/rebol,hostilefork/rebol,draegtun/ren-c,giuliolunati/ren-c,codebybrett/ren-c,kealist/ren-c,rgchris/ren-c,giuliolunati/ren-c,draegtun/ren-c,kealist/ren-c,codebybrett/ren-c,codebybrett/ren-c,hostilefork/rebol,giuliolunati/ren-c,rgchris/ren-c,codebybrett/ren-c,hostilefork/rebol,codebybrett/ren-c,rgchris/ren-c,codebybrett/ren-c