Can't erase b-numberinput value.

[mateuswetah]

Overview of the problem

Buefy version: 0.8.6
Vuejs version: 3.0.1
OS/Browser: Ubuntu 18.04 / Firefox

Description

Currently b-numberinput sets it's value to 0 if an user tries to erase the input. We can programmatically initialize the value as null, for example, but once input started, we can't set it internally to null or any empty state.

Steps to reproduce

Put a listener on @input event and check that by erasing the input, the internal value will always be set to 0, even if erased.

Expected behavior

I know this may be the expected way to a numeric input to work and might have something to do with the Number constructor... but in some cases (such as implementing a list of filters), the concept of an empty value is desirable. I really need to have it totally cleared once my user deletes via typing.