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Hm. Is $0 not an amount of money?



Writing a check for $0 is not an instruction to pay. Paying $0 is equivalent to not paying.


> Writing a check for $0 is not an instruction to pay.

By describing it as a check you've already acknowledged it as an instruction to pay.

> Paying $0 is equivalent to not paying.

It's equivalent in terms of the final balance, but it's not the same thing in other respects. If I sent you a check for $0, you would wonder how I got your address. There are a variety of ways that it would be different from me not sending you a check for any amount of money at all.


is "0" ~= NaN ~= []

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