implement array.copyWithin() for numeric and string arrays#304
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Summary
array.copyWithin(target, start, end?)for bothnumber[]andstring[]llvm.memmovefor correct overlapping copy semanticsfill()negative index handling — now resolves from end instead of clamping to 0Test plan
tests/fixtures/arrays/array-copywithin.ts— basic copy, range copy, string array, overlapping regionnpm run verify:quickpasses (tests + Stage 1 self-hosting)🤖 Generated with Claude Code