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[Validator] Deprecated "checkDNS" option in Url constraint #25516
referenced this pull request
Jan 3, 2018
I'm actually sad to see this go. Adding the functionality back into our project as a customized extension was not difficult, but I think it odd that there was so little discussion around the deprecation. If the underlying functionality is deemed inconclusive because of false positives, that's something that should be understood by the consuming application. We know that, and use this functionality as just one piece of a greater validation strategy. Having it as an option was just that, an option.