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<?php mb_substitute_character(0xfffd); var_dump(bin2hex(mb_convert_encoding("A\xfd\xbf\xbf\xbf\xbf\xbfB", 'UTF-16', 'UTF-8')));
Output for git.master, git.master_jit, rfc.property-hooks
string(32) "0041fffdfffdfffdfffdfffdfffd0042"

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