How to allow extensions in phone numbers

[fxlemire]

Hi,

First of all thanks for this package, it's really great!

I love the UX of <NumberFormat allowEmptyFormatting format="+1 (###) ###-####" _mask="_" type="tel" />. However, I've noticed that when using format, it then restricts the length of the input.

I would love to allow users to optionally provide phone extensions. For example, this is a valid phone number according to libphonenumber-js: +1 (414) 444-1919 #123456789 (# or ,). Is there an easy way with NumberFormat ? Either by allowing to go beyond the length of the provided format and leave it unformatted, or providing an optional format at the end? I've tried with isAllowed but it seems like it does not go hand-in-hand with format 😕

I've made a quick attempt at specifying my custom format, but must have done something wrong because the placeholder I return from the formatting can be erased.

Thanks so much for your help!