Feature request – rounding precision

Hi

I have many small products which means that when a coupon is applied the rounding is not accurate enough (using GBP with 2 decimal places being displayed). This means I need wc_get_rounding_precision() to return 6 rather than 4.

I can’t see a way of doing this as WC_ROUNDING_PRECISION is a constant 4, so would it be possible to add a filter to wc_get_rounding_precision() please?

E.g.

function wc_get_rounding_precision() {
	$precision = wc_get_price_decimals() + 2;
	if ( absint( WC_ROUNDING_PRECISION ) > $precision ) {
		$precision = absint( WC_ROUNDING_PRECISION );
	}
	apply_filters( 'woocommerce_rounding_precision', $precision );
	return $precision;
}

Many thanks! A great plugin.
Mike