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<?php var_dump(mb_check_encoding("+999999uJ", 'UTF-7')); var_dump(mb_convert_encoding("+999999uJ", 'UTF-8', 'UTF-7'));
Output for git.master, git.master_jit
bool(true) string(6) "緷"
Output for rfc.property-hooks
bool(false) string(7) "緷?"

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