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<?php mb_substitute_character(0xfffd); var_dump(bin2hex(mb_convert_encoding("\x61\xF1\x80\x80\xE1\x80\xC2\x62",'UTF-16','UTF-8')));
Output for git.master, git.master_jit, rfc.property-hooks
string(20) "0061fffdfffdfffd0062"

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