Currency Validation

I've loooked around but don't see a validator that validates currency when a person enters data in the field. I see a couple options for formatting a number in table view with a $, but not input validation.

I tried:

Field::inst( 'price' )->validator( 'Validate::numeric' ),

This works for input with an amount like 79.83 but in table view it renders (expectedly) without a $

I found this:

{ data: "price", render: $.fn.dataTable.render.number( ',', '.', 0, '$' ) },

but in table view it renders as a rounded whole number:

$80

This will confuse the administrator. How do I get it to render as $79.83?