Treat empty value in Format Cell -> Decimal places as 0
Press CTRL+1 or RMB -> Format cell.
Navigate to either Number, Currency or Accounting category.
Leave "Decimal places" field empty.
Whenever you empty "Decimal Places" field you can't go on because error is raised "Your entry cannot be used".
This is annoying because empty field and 0 have the same meaning in this context.
I noticed that majority of the people using backspace intuitively to make this field empty meaning no decimal places is expected aka 0 but facing with an error message described above.
Make empty field and field with 0 value behave in the same way - no decimal places.