Just some general questions about judy and how well it works.

As I understand, array members that are uninitialized (have no value assigned,) take up no space, is this the case?

Can I define and use a custom data type in a judy array?

What is the size of a judy array compared to the size of a regular array (this is probably best expressed as a percent(of course if array members that are uninitialized take up no space the answer can be variable))?