Use flags instead of boolean in ConfigValidator for checking version field

src/Composer/Command/ValidateCommand.php

@@ -87,7 +87,7 @@ EOT
         $checkAll = $input->getOption('no-check-all') ? 0 : ValidatingArrayLoader::CHECK_ALL;
         $checkPublish = !$input->getOption('no-check-publish');
         $checkLock = !$input->getOption('no-check-lock');
-        $checkVersion = !$input->getOption('no-check-version');
+        $checkVersion = $input->getOption('no-check-version') ? 0 : ConfigValidator::CHECK_VERSION;
         $isStrict = $input->getOption('strict');
         list($errors, $publishErrors, $warnings) = $validator->validate($file, $checkAll, $checkVersion);
 

src/Composer/Util/ConfigValidator.php

@@ -28,6 +28,8 @@ use Composer\Spdx\SpdxLicenses;
  */
 class ConfigValidator
 {
+    const CHECK_VERSION = 1;
+
     private $io;
 
     public function __construct(IOInterface $io)
@@ -40,11 +42,11 @@ class ConfigValidator
      *
      * @param string $file                       The path to the file
      * @param int    $arrayLoaderValidationFlags Flags for ArrayLoader validation
-     * @param bool   $checkVersion               Whether or not check if version field is present
+     * @param int    $flags                      Flags for validation
      *
      * @return array a triple containing the errors, publishable errors, and warnings
      */
-    public function validate($file, $arrayLoaderValidationFlags = ValidatingArrayLoader::CHECK_ALL, $checkVersion = true)
+    public function validate($file, $arrayLoaderValidationFlags = ValidatingArrayLoader::CHECK_ALL, $flags = self::CHECK_VERSION)
     {
         $errors = array();
         $publishErrors = array();
@@ -110,7 +112,7 @@ class ConfigValidator
             }
         }
 
-        if ($checkVersion && isset($manifest['version'])) {
+        if (($flags & self::CHECK_VERSION) && isset($manifest['version'])) {
             $warnings[] = 'The version field is present, it is recommended to leave it out if the package is published on Packagist.';
         }