The hard part of an editable table is knowing what changed

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Editing is the feature people ask data grid libraries for most, and "how do I get the row's values after an edit?" is one of the most-read grid questions on Stack Overflow. The question is telling. Nobody struggles to put an input box in a cell. They struggle with what comes after it: Which cells did the user change, and what were they before? Is this value allowed, and how does the user find out it is not?

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