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chore: mirror js tests and implementation #4879

Job	Run time
Examples	46s
Build (ubuntu-latest, 3.12, firefox)	44m 39s
Build (ubuntu-latest, 3.10, chromium)	16m 44s
Build (macos-latest, 3.12, firefox)	1h 34m 13s
Build (ubuntu-latest, 3.12, chromium)	17m 7s
Build (macos-latest, 3.12, chromium)	34m 43s
Build (ubuntu-latest, 3.12, webkit)	31m 23s
Build (ubuntu-latest, 3.13, chromium)	17m 44s
Lint	1m 47s
Build (windows-latest, 3.12, webkit)	24m 15s
Build (macos-15-xlarge, 3.12, webkit)	19m 14s
Build (windows-latest, 3.12, firefox)	1h 3m 34s
Build (ubuntu-latest, 3.11, chromium)	18m 17s
Build (macos-15-xlarge, 3.12, firefox)	29m 53s
Build (macos-15-xlarge, 3.12, chromium)	18m 47s
Build (windows-latest, 3.12, chromium)	27m 43s
	7h 40m 49s