// Get single value from key in instance map based on $selector::$key
// -------------------------------------------------------------------------------
// @dependence `map-fetch()`
// -------------------------------------------------------------------------------
// @param $key [Value] : breakpoint key
// @param $value [Value] : fetch value
// -------------------------------------------------------------------------------
// @return [Value]

@function get-value($key, $value: NULL) {
	@if $value == NULL {
		@return map-fetch($flint, config $key);
	} @else {
		@return map-fetch($flint, config $key $value);
	}
}