Improving performance, using caching when testing for primitives (#6252)

[Boereck]

Caching primitive type names for faster lookup if a type is primitive.
Fixes #6252

[jamesagnew]

@Boereck This is failing CI because of an android signature issue - We need to support android 26's specific weird hybrid of Java 11 and 17, which is annoying but usually not too hard.

In this case the failure appears to be Collectors.toUnmodifiableSet() which doesn't exist in A26 so you'll need to find another way of accomplishing that.

[Boereck]

Thanks for the Info! I had a look at the Android API docs and updated the solution so to something that should (hopefully) work with API level 26. I also removed a call to distinct(), because I confused the API contracts of Collectors.toMap() and Collectors.toSet() before. Duplicate entries are not a problem for Collectors.toSet().

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.58%. Comparing base (406db33) to head (d29773a).
Report is 36 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6253      +/-   ##
============================================
+ Coverage     83.54%   83.58%   +0.04%     
- Complexity    27432    27564     +132     
============================================
  Files          1707     1715       +8     
  Lines        106185   106680     +495     
  Branches      13397    13435      +38     
============================================
+ Hits          88710    89171     +461     
  Misses        11750    11750              
- Partials       5725     5759      +34     

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