address 0.23.0

Network address types with strict validation, owned & borrowed variants, and standard library conversions.
Documentation 
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/// The validity classification of a domain name or label.
#[must_use]
#[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Debug)]
pub(crate) enum NameClass {
    /// Valid & already lowercase.
    Lowercase,

    /// Valid once uppercase letters are lowercased.
    MixedCase,

    /// Invalid even ignoring case.
    Invalid,
}