[v6] Relax constraints for UserID email address validity #1641
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New checks align with the HTML5 W3C spec and should be more lax than the existing ones (meaning, addresses which passed validation before should continue to be valid). Addresses with domain such as
@localhost
are now allowed too, since presence of "." is no longer enforced.These checks should not be considered exhaustive: library users are encouraged to implement separate checks for email validity if needed.