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Malte UblandClaude Opus 5.5
a77fe8c21c
scr_dyn_object_key_set, behind every untyped property write and every member of an untyped object literal, looked the key up as many as five times: a linear scan for an own accessor or read-only entry, a lookup before the prototype walk, one before the non-extensible check, one to know whether the key was created, and one more inside the store. The own property is now looked up once. An own data property is written in place (an own setter still runs; a read-only or getter-only property still refuses), and an absent key walks the prototype chain as before and is then added by scr_dyn_obj_set, which is unchanged. zod 3, z.array(Order).parse over 500 orders: 199.8M -> 194.1M instructions per round (-2.8%). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>