Implement Serialize on std::ops::Bound

[Deedasmi]

Would it be possible to implement Serialize on bounds where Bound<T: Serialize>?

[dtolnay]

It is possible. Could you say more about your use case that requires this? Do you have a preference for how Bound would be represented?

[Deedasmi]

Diesel deserialize Postgres TsTzRanges as (Bound<DateTime>, Bound<DateTime>).

Likely follow the same conventions as other Enums, Object("Included": t.serialize());

[dtolnay]

Implemented in #1466.