GitLab

  extra parens elimination of unused vars.

- Added check to avoid pickling module __main__ for classes that are
  defined in other modules, in whichmodule

- Changed to use Py_eval_input rather than eval_input.

- Changed to use SIZEOF_LONG macro to avoid warnings on 32-bit machines.

- Added option of supplying None to pickler, which cases no data to be
  written during pickling.  This is slightly useful, in conjunction
  with persistent_id attribute to find persistent sub-objects without
  writing a pickle.