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>But today was the first time that I found I needed to test for the opposite
>case-- that of t.whatever not existing.  It's then I realized that Lua
>doesn't have a logical "not".

Lua does have a logical not...

>From the manual (section 4.6.4 - Logical Operators)

"The logical operators are 

             and   or   not "

Carlos Augusto.