///Checks whether `$list` is symmetrical.
///@ignore Documentation: http://sassylists.com/documentation.html#sl-is-symmetrical
///@requires sl-reverse
///@param {List} $list - list to check
///@example
///		sl-is-symmetrical(a b c)
///		// false
///
///@example
///		sl-is-symmetrical(a b a)
///		// true
///@return {Bool}

@function sl-is-symmetrical($list) {
  @if sl-missing-dependencies(sl-reverse) == true { @return null; }
  
  @return $list == sl-reverse($list);
}

///@requires sl-is-symmetrical
///@alias sl-is-symmetrical
 
@function sl-is-mirror($list) {
  @return sl-is-symmetrical($list);
}