I noticed yesterday the tag private-key-format. Given that wallet-import-format already exists and has three times more questions, should the two be combined in some form? Is one of them a subset of the other, or are the two topics distinct in some regard? Should private-key-format and wallet-import-format be merged?
To me, private-key-format is a superset of wallet-import-format as WIF is a private key format, but other private key formats such as
xprv are not. However tagging WIF questions as both is probably not useful, and we tag questions about the other private key formats as such. Then we could remove private-key-format, although I would prefer to keep it as catch-all for questions about a private key format which is not known.
Personally, I would assume that private-key-format is a superset, covering WIFs, mini keys (such as from Casascius coins), unencoded keys ("My script says this key is wrong!!!" -> "Because it should be a byte array, not a string"), potentially even
That said, the utility in maintaining it as a separate tag, as opposed to having dedicated tags for the mini private key format and letting BIP32/44 cover xprv seems low.
I vote for merging.