GROOVY-6640: Compilation warning when using @AutoClone on an object with collection properties
GROOVY-6646: let method with misfit vargs parameter be ignored
GROOVY-6641: ensure protocol does not show up in generated script class name
GROOVY-6647: add access check for constructor call
GROOVY-6648: @Grab not respecting initClass=false in all cases
GROOVY-6633: In each JsonOutput.toJson method added check for null