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Fixes 1 failing test in WPT /dom/abort/event.any.html (and its .worker variant): "AbortController abort(null) should set signal.reason". abort() reason parameters were typed ?js.Value.Global, and the JS->Zig conversion collapses an explicit JS null into a missing argument, so controller.abort(null) fell back to the default "AbortError" DOMException. Per the DOM spec, the abort reason defaults to a new AbortError only when the reason is not given (undefined); an explicit null must be stored as-is. The parameters are now ?js.Value, which preserves the missing vs explicit-null distinction, and the new AbortSignal.reasonFromJs helper only falls back to the default for a missing or undefined reason. Coverage: /dom/abort/event.any.worker.html 15/16 -> 16/16, /dom/abort/event.any.html 15/16 -> 16/16. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>