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<?php var_dump(json_encode("\u{00BF}"));
Output for 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.20, 8.1.0 - 8.1.7
string(8) ""\u00bf""

preferences:
82.47 ms | 409 KiB | 5 Q