Found small bug in compiler.
Line DATA ",",0,0,0,0,0
Interprets by Basic: DATA "comma",0,0,0,0,0
Interprets by ZZZIP: DATA quotes,quotes,0,0,0,0,0
Add------
DATA with comment like this: DATA 0,0,0,0 ! comment
ZZZIP interprets last DATA value as string: DATA 0,0,0,0 ! comment