Add a code number prompt type (ex : 0048)

Is your feature request related to a problem?

Right now "number" prompt type doesn't accept zero(s) on the left-hand side.
I'd need a similar prompt like number but one that accepts four or more digits whatever they are.
Use case : for a 4-digit auth code.

Describe the solution you'd like

I want to implement a prompt type to accept codes (for e.g. 4-digit codes for an authentication).

Describe alternatives you've considered

Tweaking number behaviour with an option. But this could result in unwanted breaking changes.

The question

What do you think about that?