fix(cursor, doc): Add explicit return types and casts to SmartdataDbCursor methods and update getCursorExtended signature in SmartDataDbDoc.

ts/classes.cursor.ts

@@ -15,14 +15,14 @@ export class SmartdataDbCursor<T = any> {
     this.smartdataDbDoc = dbDocArg;
   }
 
-  public async next(closeAtEnd = true) {
+  public async next(closeAtEnd = true): Promise<T> {
     const result = this.smartdataDbDoc.createInstanceFromMongoDbNativeDoc(
       await this.mongodbCursor.next(),
     );
     if (!result && closeAtEnd) {
       await this.close();
     }
-    return result;
+    return result as T;
   }
 
   public async forEach(forEachFuncArg: (itemArg: T) => Promise<any>, closeCursorAtEnd = true) {
@@ -40,9 +40,9 @@ export class SmartdataDbCursor<T = any> {
     }
   }
 
-  public async toArray() {
+  public async toArray(): Promise<T[]> {
     const result = await this.mongodbCursor.toArray();
-    return result.map((itemArg) => this.smartdataDbDoc.createInstanceFromMongoDbNativeDoc(itemArg));
+    return result.map((itemArg) => this.smartdataDbDoc.createInstanceFromMongoDbNativeDoc(itemArg)) as T[];
   }
 
   public async close() {