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It's not case-sensitive in pfSense 2.2.x, But now i can't use uppercase ipv6 address in pfSense 2.3.x (Web GUI).
ipv6 must be in lowercase
https://tools.ietf.org/html/rfc5952#section-4.3
https://forum.pfsense.org/index.php?topic=114173.msg634799#msg634799