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<?php enum Test: string { case X = 'x'; } $x = Test::X; var_dump($x instanceof BackedEnum);
Output for 8.1.1 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
bool(true)

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