docs: function _warnIfUsingStrippedFeatureFlags(FEATURES, knownFeatures, featuresWereStripped) {
      if (featuresWereStripped) {
        _emberMetalDebug.warn('Ember.ENV.ENABLE_OPTIONAL_FEATURES is only available in canary builds.', !_emberEnvironment.ENV.ENABLE_OPTIONAL_FEATURES, { id: 'ember-debug.feature-flag-with-features-stripped' });
  
        var keys = Object.keys(FEATURES || {});
        for (var i = 0; i < keys.length; i++) {
          var key = keys[i];
          if (key === 'isEnabled' || !(key in knownFeatures)) {
            continue;
          }
  
          _emberMetalDebug.warn('FEATURE["' + key + '"] is set as enabled, but FEATURE flags are only available in canary builds.', !FEATURES[key], { id: 'ember-debug.feature-flag-with-features-stripped' });
        }
      }
    }