v3: code quality pass, various bug fixes

src/model.ts

@@ -83,6 +83,14 @@ export function deserializeDump(raw: RawDump): Dump {
   };
 }
 
+export function hydrateDump(raw: unknown): Dump {
+  return deserializeDump(raw as RawDump);
+}
+
+export function hydratePlaylist(raw: unknown): Playlist {
+  return deserializePlaylist(raw as RawPlaylist);
+}
+
 export function deserializeUser(raw: RawUser): User {
   return {
     ...raw,