Validation (think sql contraints)

[john-kelly]

Elm:

https://github.com/stoeffel/elm-verify/tree/2.0.0 https://github.com/rtfeldman/elm-validate/tree/1.1.3 https://github.com/joneshf/elm-validation

Elixir:

• https://hexdocs.pm/ecto/Ecto.Changeset.html