Plausible Is What Gets Through

Automated excerpt

Every value was a number, in range, correctly typed, and wrong. That gap taught me the thing I now check for first: validators check shape, and shape is not meaning. "Is this a number" and "is this the number" are different questions, and almost every validation library I've used only answers the first. Two sources, same question, different answers I only ran that comparison because I was switching providers. Every downstream check passed, because every downstream check asked the same question: is this a number?

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