/**
* Compares two values and returns whether they are equivalent.
*
* @see http://docs.mongodb.org/manual/reference/operator/aggregation/eq/
* @see Expr::eq
* @param mixed|Expr $expression1
* @param mixed|Expr $expression2
* @return self
*/
public function eq($expression1, $expression2)
{
$this->expr->eq($expression1, $expression2);
return $this;
}
