pub fn metadata_changes_between(
immutable_metadata: &GroupMetadata,
old_mutable_metadata: &GroupMutableMetadata,
new_mutable_metadata: &GroupMutableMetadata,
) -> MetadataChangespub fn metadata_changes_between(
immutable_metadata: &GroupMetadata,
old_mutable_metadata: &GroupMutableMetadata,
new_mutable_metadata: &GroupMutableMetadata,
) -> MetadataChanges