Fix: issue 3673 isAssignableBy method StackOverflowError

[jlerbsc]

Fixes #3673 . This PR aims to standardize the method which determines whether an enumeration can be assigned to another type.

[codecov]

Codecov Report

Merging #4156 (24627a5) into master (6fa0a76) will decrease coverage by 0.019%.
Report is 2 commits behind head on master.
The diff coverage is 20.689%.

Additional details and impacted files

@@               Coverage Diff               @@
##              master     #4156       +/-   ##
===============================================
- Coverage     57.986%   57.968%   -0.019%     
- Complexity      2329      2334        +5     
===============================================
  Files            645       645               
  Lines          34508     34531       +23     
  Branches        5971      5981       +10     
===============================================
+ Hits           20010     20017        +7     
- Misses         12351     12355        +4     
- Partials        2147      2159       +12     

Flag	Coverage Δ
AlsoSlowTests	57.968% <20.689%> (-0.019%)	⬇️
javaparser-core	50.484% <0.000%> (-0.004%)	⬇️
javaparser-symbol-solver	37.128% <20.689%> (-0.005%)	⬇️
jdk-10	57.956% <20.689%> (-0.016%)	⬇️
jdk-11	57.956% <20.689%> (-0.019%)	⬇️
jdk-12	57.950% <20.689%> (-0.025%)	⬇️
jdk-13	57.956% <20.689%> (-0.019%)	⬇️
jdk-14	57.950% <20.689%> (-0.025%)	⬇️
jdk-15	57.956% <20.689%> (-0.016%)	⬇️
jdk-16	57.930% <20.689%> (-0.019%)	⬇️
jdk-8	57.952% <20.689%> (-0.019%)	⬇️
jdk-9	57.956% <20.689%> (-0.016%)	⬇️
macos-latest	57.962% <20.689%> (-0.019%)	⬇️
ubuntu-latest	57.947% <20.689%> (-0.019%)	⬇️
windows-latest	57.950% <20.689%> (-0.019%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...declarations/ResolvedReferenceTypeDeclaration.java	83.561% <100.000%> (+0.463%)	⬆️
...model/declarations/JavaParserClassDeclaration.java	80.272% <100.000%> (ø)
...rmodel/declarations/JavaParserEnumDeclaration.java	59.354% <ø> (-0.772%)	⬇️
...olver/javassistmodel/JavassistEnumDeclaration.java	50.000% <21.428%> (-5.173%)	⬇️
...ver/reflectionmodel/ReflectionEnumDeclaration.java	27.848% <0.000%> (-4.988%)	⬇️

... and 2 files with indirect coverage changes

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[jlerbsc]

I'm not sure this PR fixes all cases but it fixes your issue.