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Permit underscores in DNSNames if-and-only-if replacing all underscores results in valid LDH labels during BR 1.6.2's permissibility period
This lint encodes a brief period from December 10th 2018 to April 1st 2019 wherein CABF BR permitted underscores within DNS names if-and-only replacing each underscore with a hyphen would result in a valid LDH label.
@sleevi gentle re-engagement on this