Improved typing of PermissionGrant.parse() to avoid misuse

[thehenrytsai]

1. Improved typing of PermissionGrant.parse() to avoid misuse
2. Detected and fixed a couple of unimportant misuses in the tests after the above change (case in point).

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.64%. Comparing base (158470f) to head (2d5cf5f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #760      +/-   ##
==========================================
+ Coverage   98.57%   98.64%   +0.07%     
==========================================
  Files          73       73              
  Lines       10986    10987       +1     
  Branches     1582     1585       +3     
==========================================
+ Hits        10829    10838       +9     
+ Misses        151      143       -8     
  Partials        6        6              

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[LiranCohen]

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