unrolled-2map-as ( xseq yseq len quot: ( x y -- newx ) exemplar -- newseq )
Unrolled sequence iteration combinators

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Inputs and outputs
xseqa sequence
yseqa sequence
lenan integer
quota quotation with stack effect ( x y -- newx )
exemplara sequence
newseqa sequence

Word description
Unrolled version of 2map-as that iterates over the first len elements of xseq and yseq. len must be a compile-time constant. If seq has fewer than len elements, raises an unrolled-bounds-error.