Adding convenient methods to find out if a method is a variable/fixed arity method

[jlerbsc]

No description provided.

[codecov]

Codecov Report

Merging #3196 (378d5a9) into master (491dcb9) will decrease coverage by 0.000%.
The diff coverage is 50.000%.

@@              Coverage Diff              @@
##            master     #3196       +/-   ##
=============================================
- Coverage   53.126%   53.125%   -0.001%     
=============================================
  Files          451       451               
  Lines        25112     25114        +2     
  Branches      3786      3786               
=============================================
+ Hits         13341     13342        +1     
  Misses       10685     10685               
- Partials      1086      1087        +1     

Flag	Coverage Δ
AlsoSlowTests	53.125% <50.000%> (-0.001%)	⬇️
javaparser-core	53.125% <50.000%> (-0.001%)	⬇️
jdk-10	53.125% <50.000%> (-0.001%)	⬇️
jdk-11	53.125% <50.000%> (-0.001%)	⬇️
jdk-12	53.125% <50.000%> (-0.001%)	⬇️
jdk-13	53.125% <50.000%> (-0.001%)	⬇️
jdk-14	53.125% <50.000%> (-0.001%)	⬇️
jdk-15	53.125% <50.000%> (-0.001%)	⬇️
jdk-16	53.125% <50.000%> (-0.001%)	⬇️
jdk-8	53.123% <50.000%> (-0.001%)	⬇️
jdk-9	53.125% <50.000%> (-0.001%)	⬇️
macos-latest	53.113% <50.000%> (-0.001%)	⬇️
ubuntu-latest	53.113% <50.000%> (-0.001%)	⬇️
windows-latest	53.113% <50.000%> (-0.001%)	⬇️

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Impacted Files	Coverage Δ
...ithub/javaparser/ast/body/CallableDeclaration.java	59.302% <50.000%> (-0.110%)	⬇️

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