In my state object for 2htdp, I have entries that are normally natural numbers. When the value of a particular entry is not meaningful during a certain activity, I could just leave the value as whatever it was before, but I would prefer to set it to an invalid value (such as -1 or #f) to indicate that it’s not being used. Is there any stylistic reason to prefer one over the other, and will the answer be different when I use Typed Racket?
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