FR: Support small modifier for NumericInput

Environment

• Package version(s): 3.8
• Browser and OS versions: Chrome 70

Feature request

I like to make a form using small modifier on components. I can use small modifier on InputGroup and Button but MenuItem and NumericInput does not support small modifier. I tried className={Classes.SMALL} but it did not work. You can look at screenshot below as an example

Could you implement support for these components? Probably there are other components that does not support small modifier. I prefer support for all components which can be used inside a form.

Examples

<Button small={true} rightIcon="double-caret-vertical" .../> <InputGroup small={true} .../> <NumericInput leftIcon="arrow-top-left" .../> // does not support small modifier <NumericInput .../>