jquery-input | A jQuery plugin and polyfill for the HTML5 input event | Plugin library

This piece of code lets me write a phone number to my contact form as (XXX) XXX-XXXX format. (working example is at https://www.fxmerkezi.com/ucretsiz-danismanlik/)

But I need it to be done like 0XXXXXXXXXX first character must be 0 and no letters or any other characters shouldt be allowed.

This is the code in my head tags;

I am using the jquery-inputmask plugin to handle integer/float numbers, my options for masking are

Glancing through the source, it looks like loading the date extensions should allow me to use a mask like mm/dd/yyyy.

Expected behavior: clicking into the field should allow me to enter something like 12/25/2018, replacing the mask with my input as I type.

Actual behavior: clicking into the field populates the field with the mask, but places my cursor at the end and does not allow me to type.

I am using the jquery-inputmask-rails gem. Ultimately: it is pulling in Robin Herbots' inputmask jQuery plugin.

As instructed in the jquery-inputmask-rails gem, I put this in application.js:

I have tried various other Stackoverflow examples and cannot get it to work. I need an input mask that validates the input is from 0 to 254.

MY CURRENT ATTEMPT:
This is from the example & fails utterly...