code: public <T extends Number> ComparatorCondition eq(Set<T> value) {
          return new ComparatorCondition("=", this, new LiteralOperand(value));
      }
docs: Returns a <a href=
  "http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.SpecifyingConditions.html#ConditionExpressionReference.Functions"
  >comparator condition</a> (that evaluates to true if the attribute value
  referred to by this path operand is equal to the specified value) for
  building condition expression.