To some extent, it does own it. Ever tried to push even a mildly controversial patch to LLVM or Clang upstream? If Apple guys are against it, it&#x27;s a full stop, no matter how many other parties are interested.<p>And their reasons to be against a particular patch are often as simple as that it&#x27;ll break compatibility with their <i>internal</i>, <i>unpublished</i> changes to LLVM.<p>Learned it the hard way...