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Three related fixes: 1. Every JS function body binds arguments to (cons p1 ... __extra_args__), so arguments[k] and arguments.length work as expected. 2. Array.from(iter, mapFn) invokes mapFn through js-call-with-this with the index as second arg (was (map-fn x), missing index and inheriting outer this). 3. thisArg defaults to js-global-this when omitted (per non-strict ES). conformance.sh: 148/148.