Align `Intl.DateTimeFormat` constructor with spec-mandated initialization order#5336

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Vellumic wants to merge 3 commits intoboa-dev:mainfrom

Vellumic:fix/intl-dtf-ctor-observable-behavior

Commits on Apr 12, 2026

Fix a spec violation in `Date.prototype.toLocaleString`
Vellumic
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Commits on Apr 13, 2026

Add test
Vellumic
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Commits on Apr 15, 2026

Fix observable behavior of `Intl.DateTimeFormat` constructor
Vellumic
committed