RadixTree.MK

Keys are stored in a way that they can't be accessed by reference so we allow array (and string) keys to be of mutable type.

alias MK = const(Unqual!(U))[]
struct RadixTree(K, V, A = Mallocator)
static if(is(K == U[], U))
alias MK = const(Unqual!(U))[]
alias MK = K

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