In some cases it is useful to have access to the exact pairs that trip the kerningValidator (for fixing, editing, warning). So kerningValidator keeps track of the pairs, then returns them with the other results. In order not to break existing calls to kerningValidator, rename it to kerningValidatorReportPairs and add a small wrapper that filters only returns the first two items.
In some cases it is useful to have access to the exact pairs that trip the kerningValidator (for fixing, editing, warning). So kerningValidator keeps track of the pairs, then returns them with the other results. In order not to break existing calls to kerningValidator, rename it to kerningValidatorReportPairs and add a small wrapper that filters only returns the first two items.

googlefonts/fonttools,fonttools/fonttools