code: def load_internal_cache(cls, pex, pex_info):
      
      internal_cache = os.path.join(pex, pex_info.internal_cache)
      with TRACER.timed('Searching dependency cache: %s' % internal_cache, V=2):
        if os.path.isdir(pex):
          for dist in find_distributions(internal_cache):
            yield dist
        else:
          for dist in itertools.chain(*cls.write_zipped_internal_cache(pex, pex_info)):
            yield dist
docs: Possibly cache out the internal cache.