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B782: evaluate string, get length in Y
Used by the routines at B77C, B78B and B7AD.
B782 20 A3 B6 JSR $B6A3 evaluate string
B785 A2 00 LDX #$00 set data type = numeric
B787 86 0D STX $0D clear data type flag, $FF = string, $00 = numeric
B789 A8 TAY copy length to Y
B78A 60 RTS
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