code: public Criteria is(@Nullable Object o) {
  		if (o == null) {
  			return isNull();
  		}
  		predicates.add(new Predicate(OperationKey.EQUALS, o));
  		return this;
  	}
docs: Crates new {@link Predicate} without any wildcards. Strings with blanks will be escaped
  {@code "string\ with\ blank"}
  
  @param o
  @return