Check handling list keys in URI

What if the list key is an identityref, enum, or leafrefs? Do we handle the prefixes well?
Make a research about where URL encoding is allowed, where is it a must and where it is forbidden.
What if the list key is complicated like it is a compound key of two leafs and one is of int type and the second one is something like union { string, identityref } and there is a when statement like "if the first key is even number, then the second key is string, otherwise it is the identityref (perhaps to an identity from another module)" . Is such YANG even allowed? And if so, do we handle such situations well?

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