robe-hibernate/src/main/java/io/robe/hibernate/criteria/api/criterion/Restrictions.java
public static Restriction le(String name, Object value){
        return new Restriction(Operator.LESS_OR_EQUALS_THAN, name, value);
    }
public static Restriction le(String name, Object value){
        return new Restriction(Operator.LESS_OR_EQUALS_THAN, name, value);
    }
'<=' less or equals than operator