anchor.diff:      assert(_cache.length <= maximumSize);
       return result;
     }
  -}+}
  
positive.code: 
  // TODO: Implement memory based limiting, once `approximateByteCount` is exposed in engine
  class PictureCache {
    final Map<Object, PictureStreamCompleter> _cache = <Object, PictureStreamCompleter>{};
  
    /// Maximum number of entries to store in the cache.
    ///
  
negative.code:   /// evicted when adding a new entry.
    int get maximumSize => _maximumSize;
    int _maximumSize = _kDefaultSize;
  
    /// Changes the maximum cache size.
    ///
    /// If the new size is smaller than the current number of elements, the
  