public static IUniqueList <TRecord, TRecordListAssociation> WithRecords <TRecord, TRecordListAssociation>(this IUniqueList <TRecord, TRecordListAssociation> list, in List <TRecord> records)
public static IEnumerable <TRecord> GetRecords <TRecord, TRecordListAssociation>(
this IUniqueList <TRecord, TRecordListAssociation> list)
where TRecordListAssociation : IUniqueListAssociation <TRecord>
where TRecord : class, IUniqueListRecord
=> list.GetAssociations()?.Select(each => each.GetRecord());
