Can't set a 0 (empty) value, reverts to default #135

Whenever a user submits a value that is empty() (ie. 0, "", etc) then the field's default value is used instead.

Specifically, I'm trying to get the user to enter a number into a field. my default is 1, but 0 is a valid entry. If the user submits 0, then CMB2 sees this as an empty() value and resets it to the default (1).

Is there a way around this?

The code that seems to be affecting this is
CMB2_Field->escaped_value():

        if ( false === $cb || $this->escaping_exception() ) {
            // If requesting NO escaping, return meta value
            return ! empty( $meta_value ) ? $meta_value : $this->args( 'default' );
        }

        // escaping function passed in?
        $func       = $func ? $func : 'esc_attr';
        $meta_value = ! empty( $meta_value ) ? $meta_value : $this->args( 'default' );