Saurabh Nanda

@tomjaguarpaw can you please reopen this issue. I'd like to pick this up and submit a PR.

This PR isn't going to be easy, and may need some brainstorming. Quoting from the [relevant PG documentation:](https://www.postgresql.org/docs/current/static/datatype-numeric.html) ----- > The type numeric can store numbers with a very large...

> Sure, though perhaps you could clarify exactly what this issue is about. It seems that the `Default Constant` and `Default QueryRunner` instances for `PGNumeric` are missing.

Chiming in for this. Also, sometimes validations also need to be non-pure.

Do you need some help with the tutorial/guide?

Something like that. What's an easier way to write it? ``` do pokemonName

Does that mean I can't do a monadic operation like uniqueness checks against a DB in this validation layer?

So, would it be this: ``` monadic $ do pokemonName

I actually want to raise a PR to make the docs better with examples of common use-cases.

I think in view of #476 this issue should be re-opened. Probably prepare if for Hackoberfest so that we can tackle this as a community and get it fixed once...