Literals may be ambiguously resolved as classes on case insensitive filesystems

When a candidate class literal is analyzed, e.g. :

declare Foo
  f1 : Bar = new Bar()
  f2 : boolean = false 
end

"Bar" is tentatively resolved (twice) and its f.q.n. is substituted as needed.
However, even "false" is tentatively resolved as well.

On a case insensitive filesytems, the presence of a class named False will cause the literal to be resolved erroneously.
The same will happen to "true" and "null"