Types IsoCode639_X: please derive Copy, Hash, EnumVariantNames, Deserialize and Serialize also

[getreu]

The enums IsoCode639_1 and IsoCode639_3 are part of your public API.

Please consider to replace them by the types in the crate codes-iso-639.

If this is not possible, please derive Copy, Hash, EnumString, EnumVariantNames, Deserialize, Serialize also.
This would make them much more useful for the consumer of your API.

#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};
use strum_macros::{EnumString, EnumVariantNames};

#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, EnumString, EnumVariantNames)]
#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
#[allow(clippy::upper_case_acronyms)]
#[strum(ascii_case_insensitive, serialize_all = "kebab_case")]
pub enum IsoCode639_1 {...}

The same applies to IsoCode639_3.