An iterator over the keys and values in a QP-trie.
An iterator over immutable references to keys and values in a QP-trie.
An iterator over immutable references to keys and mutable references to values in a QP-trie.
An occupied entry in the trie.
A QP-trie. QP stands for - depending on who you ask - either “quelques-bits popcount” or
“quad-bit popcount”. In any case, the fact of the matter is that this is a compressed radix
trie with a branching factor of 16. It acts as a key-value map where the keys are any value
which can be converted to a slice of bytes.
A vacant entry in the trie.