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Bugs
It is reported to be useless due to too many bugs. If (HL) < A then the error handler is called with A = (HL).
OOPS!!! hence Hence the routine bombs out when a character < A is passed to it in (HL). From stream IX it is even worse. It skips over the character correctly but (IX) < A or (IX) > A cause an error (always RC_QUIT!!!).
Related calls
GN_Cls, classify character
GN_Skd, skip delimiter
GN_Skt, skip to value