SCXML Calculator example - 0 cannot be used as the first number

Description:

It is not possible to use 0 if it is not following another number. For example you cannot write 0, but you can write 10 or -10.

You can write numbers starting with  a 0, if you only click on the dot. **

Steps to reproduce:

Open the SCXML calculator 

First write any number above 10 (it will work)
Try to write 0 (it will not let you)

Expected behavior:

You should be able to write 0 as the first number
Observed behavior:

You should be able to write 0 as the first number.
Special notes:

It it easier to see while also looking at the "application output".