JoinPath joins all path elements into a single path.

OrderedMapKeys returns the keys of the map m in sorted order.

SplitPath splits key into individual path elements.

PathTypeIndex is array index like 0/1 in a[0][1].b.

PathTypeKey is map key like a/b in a[0][1].b.

Storage is a key-value store that verifies the format of the key.