builtins: add zip xs ys for pairing two lists#187
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Pairing two lists element-wise was a missing primitive. Producing [[x0,y0],[x1,y1],...] forced users to map + at + idx ranges, which is verbose for what is a one-token idiom in every other language. Opcode allocated: zip. Truncates to the shorter input. Works on any list type pair, returning a list of two-element lists.
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Pairing two lists element-wise was a missing primitive. Without it, users hand-rolled map + at + range, which is verbose for a one-token idiom.
Implementation:
Tests: cross-engine regression tests + examples/zip.ilo with -- run: directives.