[RavSinghChandan]

/ViewArea, /ViewClip, /PrintArea and /PrintClip are each declared with an empty list of acceptable values:

cls.view_area = _add_prop_name("/ViewArea", [], None)

So any name is written through unchecked, and the generated docstrings read "Acceptable values: []":

>>> viewer_preferences.view_area = "/Nonsense"
>>> viewer_preferences.view_area
'/Nonsense'

All four name one of the five page boundaries, which PageAttributes already defines, so the allowed set is taken from there rather than spelled out again. direction and duplex beside them already reject a value outside their set.

Reverting the change fails the four new tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.00%. Comparing base (38170a2) to head (5e51045).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4014   +/-   ##
=======================================
  Coverage   98.00%   98.00%           
=======================================
  Files          57       57           
  Lines       11124    11126    +2     
  Branches     2086     2086           
=======================================
+ Hits        10902    10904    +2     
  Misses        124      124           
  Partials       98       98           

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[RavSinghChandan]

Both done. Dropped the alias, and the box names are now a BOX_NAMES constant next to f_obj, which the tests parametrise over so the five names are only written once.

[RavSinghChandan]

Both done - dropped the alias, and the box names are now a BOX_NAMES constant next to f_obj, which the tests parametrise over so the five names are only written once.

Thanks for fixing the spacing, that was mine from resolving the conflict.