Start implementation of model relations

src/util/collection/Collection.ts

@@ -16,8 +16,11 @@ type ComparisonFunction<T> = (item: CollectionItem<T>, otherItem: CollectionItem
 import { WhereOperator, applyWhere, whereMatch } from './where'
 
 const collect = <T>(items: CollectionItem<T>[]): Collection<T> => Collection.collect(items)
+const toString = (item: unknown): string => String(item)
+
 export {
     collect,
+    toString,
     Collection,
 
     // Types