Feature request: alternative input method to shorten input if many decimals displayed by typing decimal seperator

Hello!
If a input is e.g. masked with `ui-number-mask="4"` it would be very nice if input procedure could be shortened by typing the decimal seperator.
For example... you want to enter value 0.5
Now you have to type 5 + 0 + 0 + 0
It would be much faster to type . + 5
An other example... you want to enter 1.2
You have to type 1 + 2 + 0 + 0 + 0
Much faster: 1 + . + 2

Thanks a lot and best regards
Klaus

Start by locating the ui-number-mask directive and the decimal-separator handling in the input-mask implementation. Reproduce the reported 0.5 and 1.2 cases with ui-number-mask="4"; done means typing the separator accepts the shortened forms without breaking existing numeric input behavior.

Written by the indexing model from the issue text.