///
/// Removes all false and null values from $list
///
/// @access private
///
/// @link http://sassylists.com/documentation.html#purge
///
/// @param {List} $list
///
/// @return {List}
///
/// @group Internal Functions
///
@function flint-purge($list) {
	$result: ();

	@each $item in $list {
		@if flint-is-true($item) {
			$result: append($result, $item, list-separator($list));
		}
	}

	@return $result;
}