Joe Savona de929fcc40 Partial support for update expressions
Adds limited support for UpdateExpressions (`x++`). We now support the postfix 
form (`x++` ok, `++x` is a todo) and only when the argument is an identifier. We 
can relax these restrictions with more work, but this PR should be sufficient 
for the examples we've seen so far.
2023-02-02 07:53:24 -08:00
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