Merge branch '6.4' into 7.3

* 6.4:
  use false instead of null to hide the currency symbol
  [FrameworkBundle] Fix block type from `OK` to `ERROR` when local vault is disabled in `SecretsRemoveCommand`
  Fix wrong boolean values
  [Messenger] Fix NoAutoAckStamp handling in Worker::flush()

Author: nicolas-grekas

Tests/OptionsResolverTest.php

@@ -1443,7 +1443,6 @@ public function testNormalizerCanAccessOtherOptions()
         $this->resolver->setDefault('norm', 'baz');
 
         $this->resolver->setNormalizer('norm', function (Options $options) {
-            /** @var TestCase $test */
             Assert::assertSame('bar', $options['default']);
 
             return 'normalized';
@@ -1461,8 +1460,7 @@ public function testNormalizerCanAccessLazyOptions()
         $this->resolver->setDefault('norm', 'baz');
 
         $this->resolver->setNormalizer('norm', function (Options $options) {
-            /** @var TestCase $test */
-            Assert::assertEquals('bar', $options['lazy']);
+            Assert::assertSame('bar', $options['lazy']);
 
             return 'normalized';
         });
@@ -2643,9 +2641,9 @@ public function testResolveOptionsDefinedByOptionConfigurator()
         ;
         $introspector = new OptionsResolverIntrospector($this->resolver);
 
-        $this->assertTrue(true, $this->resolver->isDefined('foo'));
-        $this->assertTrue(true, $this->resolver->isDeprecated('foo'));
-        $this->assertTrue(true, $this->resolver->hasDefault('foo'));
+        $this->assertTrue($this->resolver->isDefined('foo'));
+        $this->assertTrue($this->resolver->isDeprecated('foo'));
+        $this->assertTrue($this->resolver->hasDefault('foo'));
         $this->assertSame('bar', $introspector->getDefault('foo'));
         $this->assertSame(['string', 'bool'], $introspector->getAllowedTypes('foo'));
         $this->assertSame(['bar', 'zab'], $introspector->getAllowedValues('foo'));