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$LEN
: Length of string$LEN(string)
returns the length of string in bytes. If
string is not surrounded by quotes, it is interpreted as if it were
quoted (so it is not expanded if it is a macro). Thus, in the example
@m SS string $LEN(SS)
the value returned is 2, not 5.
To expand the argument before taking the length, one can say something like
@m $XLEN(s) $LEN(s)