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On Tue, Feb 10, 2009 at 11:16 AM, Steve Holden <steve@holdenweb.com> wrote:

That's true, but the same \*could\* be said about the existing
optimizations for objects that define their own \_\_contains\_\_.

No, because there isn't a \_\_not\_contains\_\_, so you cannot define the inverse operation differently. "not a in b" and "a not in b" have exactly the same effects.

\--
Daniel Stutzbach, Ph.D.
President, Stutzbach Enterprises, LLC