- update to 2.22:
  * Added a ``satnum_str`` attribute, exposing the fact that the C++ now
    stores the satellite number as a string; and check that ``satnum`` is
    never greater than 339999.
  * Fixed the units of the ``nddot`` attribute when the value is loaded
    from an OMM record.  (Since the TLE computation itself ignores this
    attribute, this did not affect any satellite positions.)
  * Enhanced the fallback Python version of ``twoline2rv()`` to verify
    that TLE lines are ASCII, and added documentation using it to
    double-check TLEs that might suffer from non-ASCII characters.
  * If the user doesn’t set a satellite’s ``classification``, it now
    defaults to ``'U'`` for ‘unclassified’.
  * Added ``dump_satrec()`` to the ``sgp4.conveniences`` module.
  * Fixed the ``Satrec`` attribute ``.error``, which was previously
    building a nonsense integer from the wrong data in memory.
  * Removed ``.whichconst`` from Python ``Satrec``, to help users avoid
    writing code that will break when the C++ extension is available.

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