Configuration elements should be able to be validated.

[daveworth]

It would be super sweet to be able to specify types for configuration elements such as

config :service_port, type: :integer
config :service_url, type: :string, matching: %r{https://some-service.example.com/api/v\d}

I can volunteer @leakybucket to implement this (or myself).

[jkassemi]

Agreed. My configurations would be nicely cleaned up if this were in place.

We could build on the HTML5 validation spec naming convention - know of any other specs or existing implementations that would make a good starting point?