dist/u.packed.js
function(sel) {
      if (!this.length) {
        return this;
      }
      var el = this[0];
      return u(array.filter.call(el.parentNode.children, function(child) {
        return sel ? child !== el && u(child).is(sel) : child !== el;
      }));
    }
function(sel) {
      if (!this.length) {
        return this;
      }
      var el = this[0];
      return u(array.filter.call(el.parentNode.children, function(child) {
        return sel ? child !== el && u(child).is(sel) : child !== el;
      }));
    }
function ( sel ) { if ( ! this . length ) { return this ; } var el = this [ 0 ] ; return u ( array . filter . call ( el . parentNode . children , function ( child ) { return sel ? child !== el && u ( child ) . is ( sel ) : child !== el ; } ) ) ; }
siblings method
get element siblings
@param  {string} [sel] - selector to filter siblings
@return {object}         sibling elements
siblings method get element siblings