+/- infinity value for date/timestamp/timestamp with time zone

[xiangjinwu]

Is your feature request related to a problem? Please describe.
In PostgreSQL, the types date/timestamp/timestamp with time zone support special infinity and -infinity values, just like real / double precision / decimal.

time cannot be infinity.

interval cannot be infinity either. But there do exists a checking function isfinite ( interval ) → boolean, which is "currently always true" according to PostgreSQL doc.

Describe the solution you'd like
Just like Decimal, make the wrapper type an enum rather than newtype. Specially, timestamp with time zone is not wrapped right now.

Describe alternatives you've considered
Nothing yet. Suggestions are welcome.

Additional context
Just raising awareness of this difference. No urgent need for implementation.

[github-actions]

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