Îõ³h$Ê¡Kazuki Okamoto see LICENSEkazuki.okamoto@kakkun61.com experimentalGHCSafe&è” +single-tuple-0.1.2.0-6NkBLfeWgBV3AgfnbECBrvData.Tuple.SingleSinglewrapunwrap $fSingleUnit$fSingleOneTuple $fSingleOnly$fSingleIdentity