GROOVY-11516: Improve consistency of treatment for internal properties

[paulk-asert]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.6630%. Comparing base (6cd477b) to head (c6bbbb6).
⚠️ Report is 1451 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2118        +/-   ##
==================================================
+ Coverage     68.5957%   68.6630%   +0.0673%     
- Complexity      29233      29411       +178     
==================================================
  Files            1426       1427         +1     
  Lines          113494     113626       +132     
  Branches        19548      19635        +87     
==================================================
+ Hits            77852      78019       +167     
+ Misses          29088      29043        -45     
- Partials         6554       6564        +10     

Files with missing lines	Coverage Δ
src/main/java/groovy/lang/MetaClassImpl.java	76.8855% <100.0000%> (+0.2991%)	⬆️

... and 105 files with indirect coverage changes

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[paulk-asert]

Relooking at GROOVY-11928.