avoid padding a struct to be hashed

[wsdwsd0829]

alternatively

• (NSUInteger)hash
  {
  #pragma pack(push,1)
  struct {
  CGSize viewportSize;
  ASScrollDirection scrollableDirections;
  NSUInteger elementsHash;
  NSUInteger layoutDelegateClassHash;
  NSUInteger additionalInfoHash;
  } data = {
  _viewportSize,
  _scrollableDirections,
  _elements.hash,
  _layoutDelegateClass.hash,
  [_additionalInfo hash]
  };
  #pragma pack(pop)
  return ASHashBytes(&data, sizeof(data));
  }

I am less confident about what #pragma pack(push,1) is doing

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[rcancro]

Let's try these things and see if they work:

• Try setting the values of the struct explicitly like the comment in ASHashBytes suggests
• Try changing the type of ASScrollDirection from unsigned char to NSUInteger

If neither of those work, let's land this! :)