[🐞 bug] unmask called on focus

[aronhoyer]

Description of the bug

If mask is defined, unmask gets called on a potentially empty string, causing two unnecessary re-renders.

In the case of my team, this causes field validation to be triggered, rendering an error message even before the user enters a value.

Expected behavior

I'd expect unmask to be called only when the field contains a value.

Actual behavior

unmask gets called, causing two unnecessary renders, and triggering field validation.