Hi,

if you set a custom decimalSeperator, you won't be able to enter decimals into a numberfield.
Here is a fiddle:
https://fiddle.sencha.com/#fiddle/2gso

You won't be able to enter "." (I guess the regex doesn't allow it). However, it allows you to enter the "," character, which is what I expect. But after the blur event, it gets cleared out of the value.