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<?php mb_substitute_character("?"); var_dump(mb_convert_encoding(chr(190), 'UTF-8', 'UTF-8'));
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught ValueError: mb_substitute_character(): Argument #1 ($substitute_character) must be "none", "long", "entity" or a valid codepoint in /in/EVYB6:2 Stack trace: #0 /in/EVYB6(2): mb_substitute_character('?') #1 {main} thrown in /in/EVYB6 on line 2
Process exited with code 255.

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