Floating and negative values accepted in volume size field.

As we know that in cinder, volume size cannot be a decimal value, only integer values are accepted.
So when a user create a volume from horizon,horizon allows user to enter a decimal value or negative value in Size (GiB) field.
obviously, user can't create a volume in decimal size as there are some validation on create button,
But we can enforce more validation on the volume Size field (like user can't enter alphabets which is currently enforced), we shouldn't allow negative symbol '-' and decimal point '.' in the field too, So the user can only enter number from (0-9).