T3 RESULT: LATENT OVERFLOW DEMONSTRATED (macro sizes 27->11, hexncpy needs 27 bytes at sep!=NULL)
T4 DF-2252 confirmed: inlen=0 wrote NUL at outb[-1] (byte before buffer)
T4 DF-2253 confirmed: sep=NULL, outlen=HEX_NCPYLEN(4)=12 -> '0102030' (final nibble of 04 destroyed)
EXIT=0
804494d763fb1715ec30e662a4c4e2a3