CanonicalName should casefold non-US-ASCII chars #1470
Merged
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According to Section 6.2 [1] of RFC 4034,all uppercase US-ASCII letters in the owner name of the RR are replaced by the corresponding lowercase US-ASCII letters.
This updates CanonicalName to conform to the RFC.
[1] https://www.rfc-editor.org/rfc/rfc4034#section-6.2
Fixes #1434