giles 4ab79f5758 js-on-sx: parser handles comma operator (a, b, c) ...

Was failing with "Expected punct ')' got punct ','" because the
paren handler only consumed a single assignment. Added
jp-parse-comma-seq helpers that build a js-comma AST node with
the expression list; transpiler emits (begin ...) so each is
evaluated in order and the last value is returned.
built-ins/Object: 44/50 → 46/50. conformance.sh: 148/148.

2026-05-08 13:20:53 +00:00

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