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<?php var_dump( mb_check_encoding( '//u', '', "\xf4\x8f\xbf\xbf" ) );
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ArgumentCountError: mb_check_encoding() expects at most 2 arguments, 3 given in /in/sQct8:3 Stack trace: #0 /in/sQct8(3): mb_check_encoding('//u', '', '\xF4\x8F\xBF\xBF') #1 {main} thrown in /in/sQct8 on line 3
Process exited with code 255.

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