Record should take advantage of RecordType (if used)

Instead of simply retrieving data with index, we could take advantage of the schema information (through the RecordType) and retrieve data by field name

Start by locating the Record and RecordType definitions and the current index-based retrieval path. Determine how schema field names are represented and what behavior is expected when a RecordType is available; done means field-name retrieval works and the behavior is covered by an appropriate test.

Written by the indexing model from the issue text.