gproxy-protocol 4.1.10

GPROXY v4 connection modelling, operation declarations, vendor wire types and pairwise conversion
Documentation 
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use serde::Deserialize;
pub(super) fn present_nullable<'de, D, T>(d: D) -> Result<Option<Option<T>>, D::Error>
where
    D: serde::Deserializer<'de>,
    T: Deserialize<'de>,
{
    Option::<T>::deserialize(d).map(Some)
}
pub(super) fn present_optional<'de, D, T>(d: D) -> Result<Option<T>, D::Error>
where
    D: serde::Deserializer<'de>,
    T: Deserialize<'de>,
{
    T::deserialize(d).map(Some)
}