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LibJS: Fast-path ToTemporalTimeZone when the argument is a TimeZone
This is a normative change in the Temporal spec.
See: 54cea53
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2 changed files with 28 additions and 4 deletions
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@ -45,4 +45,22 @@ describe("normal behavior", () => {
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expect(Temporal.TimeZone.from(arg).id).toBe(expected);
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}
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});
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test("ToTemporalTimeZone fast path returns if it is passed a Temporal.TimeZone instance", () => {
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// This is obseravble via there being no property lookups (avoiding a "timeZone" property lookup in this case)
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let madeObservableHasPropertyLookup = false;
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class TimeZone extends Temporal.TimeZone {
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constructor() {
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super("UTC");
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}
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get timeZone() {
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madeObservableHasPropertyLookup = true;
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return this;
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}
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}
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const timeZone = new TimeZone();
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Temporal.TimeZone.from(timeZone);
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expect(madeObservableHasPropertyLookup).toBeFalse();
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});
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});
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