Merge master into openapi

[bkoelman]

Merges the master branch into openapi, which contains breaking changes for extensions validation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.39%. Comparing base (4635800) to head (dbde12d).
Report is 4 commits behind head on openapi.

Additional details and impacted files

@@           Coverage Diff            @@
##           openapi    #1689   +/-   ##
========================================
  Coverage    90.39%   90.39%           
========================================
  Files          461      461           
  Lines        14046    14047    +1     
  Branches      2190     2191    +1     
========================================
+ Hits         12697    12698    +1     
  Misses         914      914           
  Partials       435      435           

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