remove pre-3.6 logic

Author: baileympearson

src/cursor/find_cursor.ts

@@ -15,8 +15,6 @@ import { AbstractCursor, assertUninitialized } from './abstract_cursor';
 /** @internal */
 const kFilter = Symbol('filter');
 /** @internal */
-const kNumReturned = Symbol('numReturned');
-/** @internal */
 const kBuiltOptions = Symbol('builtOptions');
 
 /** @public Flags allowed for cursor */
@@ -34,8 +32,6 @@ export class FindCursor<TSchema = any> extends AbstractCursor<TSchema> {
   /** @internal */
   [kFilter]: Document;
   /** @internal */
-  [kNumReturned]?: number;
-  /** @internal */
   [kBuiltOptions]: FindOptions;
 
   /** @internal */
@@ -77,39 +73,13 @@ export class FindCursor<TSchema = any> extends AbstractCursor<TSchema> {
 
     const response = await executeOperation(this.client, findOperation);
 
-    // TODO: We only need this for legacy queries that do not support `limit`, maybe
-    //       the value should only be saved in those cases.
-    if (response.cursor) {
-      this[kNumReturned] = response.cursor.firstBatch.length;
-    } else {
-      this[kNumReturned] = response.documents ? response.documents.length : 0;
-    }
-
     // TODO: NODE-2882
     return { server: findOperation.server, session, response };
   }
 
   /** @internal */
   override async getMore(batchSize: number): Promise<Document | null> {
-    // NOTE: this is to support client provided limits in pre-command servers
-    const numReturned = this[kNumReturned];
-    if (numReturned) {
-      const limit = this[kBuiltOptions].limit;
-      batchSize =
-        limit && limit > 0 && numReturned + batchSize > limit ? limit - numReturned : batchSize;
-
-      if (batchSize <= 0) {
-        await this.close().catch(() => null);
-        return { cursor: { id: Long.ZERO, nextBatch: [] } };
-      }
-    }
-
     const response = await super.getMore(batchSize);
-    // TODO: wrap this in some logic to prevent it from happening if we don't need this support
-    if (response) {
-      this[kNumReturned] = this[kNumReturned] + response.cursor.nextBatch.length;
-    }
-
     return response;
   }