I encountered a strange case where a variable was changing value within the scope of an if statement, because I had a superclass with an identical variable name. I am able to reproduce it with this simple case:

class A
{
    10000 => int foo;
}

class B extends A
{
    fun void bar()
    {
        0 => int foo;

        <<< "a", foo >>>;
        {
            <<< "b", foo >>>;
        }
        <<< "c", foo >>>;
    }
}