GROOVY-6574: Make sure that an assignement of a boxed primitive doesn't change the inferred type of the variable of primitive type
GROOVY-6575: Type checker fails to check int[] arr = o
GROOVY-6268: some small updates to the maps section to fix a wrong included snippet and some asciidoc escaping issues
GROOVY-6577: Allow assignment of null to boolean
GROOVY-6528: Nicer error message for missing static method calls
GROOVY-6528: Double#isFinite exists on JDK8
GROOVY-6576: List literals should be using an optimized path and compile directly to constructor