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Malte UblandClaude Opus 5.5
6cea7a348f
Array.prototype.push.call({length: 1, 0: "x"}, "y") and its siblings
answered "not supported yet": the checked-dynamic array dispatch only ran
the methods of a receiver that is a real array, though the algorithms are
generic in the language. PR #2505 implemented them inside scr_dyn_invoke.c,
which every program that links that unit then differed on (373 DIFFERS,
108 runtime-only programs), so it was withheld.
The algorithms now live in their own gated unit, scr_dyn_array_like.c,
reached through a distinct libCall (dyn.arrayLikeProtoCall) that only a
JavaScript source emits. A native array receiver, or a live typed-ref array,
delegates to the invoke unit's dispatch, so the array path keeps one
implementation and its exact bytes. Methods: concat, copyWithin, fill,
flat, flatMap, join, pop, push, reverse, shift, splice, toReversed,
toSorted, toSpliced, unshift, with.
Each algorithm starts with `? ToObject(this value)`, so a nullish
receiver is a TypeError before any length is read — the check the invoke
unit answers for its own receivers.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>