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MISMATCH/MAXPREFIX/MAXSUFFIX



It appears to me that MISMATCH and MAXPREFIX/MAXSUFFIX overlap entirely
in capability and intent.  They appear to do the exact same thing,
modulo returning nil instead of the sequence length or zero in the
all-match case.  It is furthermore not in the least clear to me what
:from-end means to MAXSUFFIX, or how MAXPREFIX with :from-end is
different from MAXSUFFIX.  Is there any reason not to flush MAXPREFIX
and MAXSUFFIX?