Incorrent result when query using lessThan or lessOrEqual for a String field with @Index(type: IndexType.value) #318
Description
When create a IndexType.value for a string field, and query using lessOrEqual and lessThan with the value larger than then last record, eg \uffff, the query return zero record instead of all record
reproduce repo: https://github.com/lokingwei/objectbox_string_lessthan
@Entity() class Doc { int? id; @Index(type: IndexType.value) String key; Doc({ required this.key, }); } box.put(Doc(key: 'b')); box.put(Doc(key: 'c')); box.put(Doc(key: 'd')); // this line is corrent expect(box.query(Doc_.key.lessOrEqual('d')).build().find(), hasLength(3)); // expected result to be 3 but return 0 expect(box.query(Doc_.key.lessOrEqual('e')).build().find(), hasLength(3));