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Yes, the approach I tend to use, is to cache up to 10 expressions. And it
could be implemented into a utility procedure, with the caveat that one
would have to (rather, "should") remember to free associated space at end of
program. This important step may not be so easy for the developer to
remember, and no error will result if it's forgotten. In some designs, it's
very difficult even to accomplish.
I cannot see what's happening under the covers (wish I could - it'd be fun
to see how another might do it), so all I could do was raise questions. You
note I had no problem with that challenge. ;)
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