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Gennick on closing PL/SQL cursors

Jonathan Gennick, a highly respected author for Oracle Magazine, has published an excellent investigation on closing cursors in PL/SQL:

http://gennick.com/open_cursors.html

When I modified my test case (above) so that the inner block only opened 47 cursors, I could execute the code successfully. What's more, I could execute it repeatedly. As I sit here writing this, I can paste the code into SQL*Plus over, and over, and over again. So while PL/SQL doesn't implicitly close cursors at the end of a block, at least not at the end of an inner block, it seems equally clear that some cleanup is occurring when control returns from the outer block back to SQL*Plus.

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