Autoboxing does not work properly

ExtendJ 8.0.1-75-g6738dd8

ExtendJ is a bit too strict about which types it will allow autoboxing conversions for. A test case illustrating the problem:

// Test autoboxing.
// .result=COMPILE_PASS

class Test {
  public static void main(String[] args) {
    int i = f(3); // Autoboxing conversion int->Integer.
  }

  static int f(Object i) {
    return (int) i; // Autoboxing conversion Integer->int.
  }
}

This passes with Javac, but gives the following errors with ExtendJ:

    [junit] [FAIL] runTest[type/autoboxing_02p](tests.javac.TestJava8)
    [junit] Compilation failed when expected to pass:
    [junit] tests/type/autoboxing_02p/Test.java:10: error: incompatible types: Object cannot be converted to int
    [junit]     return i; // Autoboxing conversion Integer->int.

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