To to my knowledge, The Daijisen is one of the most authoritative dictionaries of Japanese, at least for contemporary usage. When they provide several writings for the same entry, are there any rules to their sorting of these writings?
I realise all of them could be considered correct, and I think brackets mean that part could be left out. Is the first spelling the recommended one? And if so, are the kana in brackets recommended or not? See for example すきみ (to peep):
Is the recommended spelling 透き見 or 透見? Or is there no recommendation at all?
I understand this information is probably in the usage information, but my Japanese is not good enough to navigate it.