* S, ( addr len -- addr' len )

ALLOT room and store the Forth string into data space as an
mstring, leaving data space aligned; and leave the length and
new body address. It is assumed that len is unsigned. An
error is thrown if len is larger than the system parameter
MAX_DATA_STR. "s-comma"

NOTE: MAX_DATA_STR is returned by

Perhaps this restriction should be removed in favor of a
normal data space overflow error.

NOTE: S, is the same as STRING, in Wil Baden's Tool Belt,
except it stores a measured string instead of a counted

FORTH/DEF dstrings ordinary primitive