/**
* Creates an instance of binary expression node, representing the construction: subject <= value
*
* @param mixed $subject logical subject
* @param mixed $value value to match the subject
*
* SQL example:
* @code
* // "id" <= 1
* Expression::ltEq("id", 1);
* @endcode
* @return BinaryExpression
*/
static function ltEq($subject, $value)
{
return new BinaryExpression($subject, BinaryLogicalOperator::lowerOrEquals(), $value);
}