docs: def getCollapseRequestsFn(self):
          """Helper function to determine which collapseRequests function to use
          from L{_collapseRequests}, or None for no merging"""
          # first, seek through builder, global, and the default
          collapseRequests_fn = self.config.collapseRequests
          if collapseRequests_fn is None:
              collapseRequests_fn = self.master.config.collapseRequests
          if collapseRequests_fn is None:
              collapseRequests_fn = True
  
          # then translate False and True properly
          if collapseRequests_fn is False:
              collapseRequests_fn = None
          elif collapseRequests_fn is True:
              collapseRequests_fn = self._defaultCollapseRequestFn
  
          return collapseRequests_fn