Fix various typos etc.

[pont-us]

Closes #33 .

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e56991c) 99.81% compared to head (e7ac8d0) 99.81%.
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #37   +/-   ##
=======================================
  Coverage   99.81%   99.81%           
=======================================
  Files          23       23           
  Lines        1062     1062           
=======================================
  Hits         1060     1060           
  Misses          2        2           

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[forman]

Fine, thanks very much! But I will reintroduce the version field as a public attribute, not an internal one.