This will probably never actually matter, but I am curious. A nested table's indices are of course some form of integer, but that could be represented as a NUMBER, or an INTEGER, or a PLS_INTEGER, or a BINARY_INTEGER, etc.
Internally, what type (if any) are the indices, and what type is returned by methods like FIRST and NEXT?
In particular I'm curious about Oracle 11g, but it would also be interesting to know about differences in other versions, if it has changed.
