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Per ES non-strict script semantics, top-level this is the global object (window/global/globalThis). Was throwing "Undefined symbol: this". Two-part fix: 1. js-global-this runtime variable set to js-global after globals are defined; js-this falls back to it when no this is active. 2. js-eval wraps transpiled body in (let ((this (js-this))) ...) so JS this resolves to bound this, or top-level to global. Fixes String(this), this.Object === Object, etc. built-ins/Object: 46/50 → 47/50. conformance.sh: 148/148.