org.hl7.fhir.core/RELEASE_NOTES.md

Validator Changes

• Snapshot Generation Changes: ** Check for slicenames without any slicing ** Check for additional slicing rules in a set of slices ** Check that the minimum cardinality of a set of slices is correct
• Clean up duplicate errors when dates/dateTimes/instants have invalid formats
• Handle unknown code systems consistently when validating coded elements

Other code changes

• Add support for R4B to loader