Why is sqlx::type_info::DataType only exposed to the crate?

[thep0y]

sqlx/sqlx-sqlite/src/type_info.rs

Line 13 in 946b6d4

pub(crate) enum DataType {

I want to implement a datetime type myself and need to implement the trait Type<Sqlite>, but I cannot use DataType::Datetime. What is the consideration behind not making it public? Alternatively, how can I implement the trait Type<Sqlite> for my own datetime type?

#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, sqlx::Type)]
pub struct UtcDateTime {
    inner: Duration,
}