Remove wire version checks for MongoDB 3.6

Author: alcaeus

src/Operation/Explain.php

@@ -42,8 +42,6 @@ class Explain implements Executable
     public const VERBOSITY_EXEC_STATS = 'executionStats';
     public const VERBOSITY_QUERY = 'queryPlanner';
 
-    private const WIRE_VERSION_FOR_AGGREGATE = 7;
-
     private string $databaseName;
 
     private Explainable $explainable;
@@ -106,10 +104,6 @@ public function __construct(string $databaseName, Explainable $explainable, arra
      */
     public function execute(Server $server)
     {
-        if ($this->explainable instanceof Aggregate && ! server_supports_feature($server, self::WIRE_VERSION_FOR_AGGREGATE)) {
-            throw UnsupportedException::explainNotSupported();
-        }
-
         $cursor = $server->executeCommand($this->databaseName, $this->createCommand(), $this->createOptions());
 
         if (isset($this->options['typeMap'])) {

src/Operation/Watch.php

@@ -69,8 +69,6 @@ class Watch implements Executable, /* @internal */ CommandSubscriber
     public const FULL_DOCUMENT_BEFORE_CHANGE_WHEN_AVAILABLE = 'whenAvailable';
     public const FULL_DOCUMENT_BEFORE_CHANGE_REQUIRED = 'required';
 
-    private const WIRE_VERSION_FOR_START_AT_OPERATION_TIME = 7;
-
     private Aggregate $aggregate;
 
     private array $aggregateOptions;
@@ -470,10 +468,6 @@ private function shouldCaptureOperationTime(Server $server): bool
             return false;
         }
 
-        if (! server_supports_feature($server, self::WIRE_VERSION_FOR_START_AT_OPERATION_TIME)) {
-            return false;
-        }
-
         return true;
     }
 }

tests/Operation/WatchFunctionalTest.php

@@ -46,8 +46,6 @@ class WatchFunctionalTest extends FunctionalTestCase
     public const INTERRUPTED = 11601;
     public const NOT_PRIMARY = 10107;
 
-    private static int $wireVersionForStartAtOperationTime = 7;
-
     private array $defaultOptions = ['maxAwaitTimeMS' => 500];
 
     public function setUp(): void
@@ -340,10 +338,6 @@ private function assertResumeAfter($expectedResumeToken, stdClass $command): voi
      */
     public function testResumeBeforeReceivingAnyResultsIncludesStartAtOperationTime(): void
     {
-        if (! $this->isStartAtOperationTimeSupported()) {
-            $this->markTestSkipped('startAtOperationTime is not supported');
-        }
-
         $this->skipIfServerVersion('>=', '4.0.7', 'postBatchResumeToken takes precedence over startAtOperationTime');
 
         $operation = new Watch($this->manager, $this->getDatabaseName(), $this->getCollectionName(), [], $this->defaultOptions);
@@ -1653,11 +1647,6 @@ private function insertDocument($document): void
         $this->assertEquals(1, $writeResult->getInsertedCount());
     }
 
-    private function isStartAtOperationTimeSupported()
-    {
-        return server_supports_feature($this->getPrimaryServer(), self::$wireVersionForStartAtOperationTime);
-    }
-
     private function advanceCursorUntilValid(Iterator $iterator, $limitOnShardedClusters = 10): void
     {
         if (! $this->isShardedCluster()) {