fix isSubClass: remove eager test which prevented checking for implementation of __subclasscheck__

- add abstract numbers issubclass tests

Author: cosminbasca

graalpython/com.oracle.graal.python.test/src/tests/test_issubclass.py

@@ -164,3 +164,13 @@ def test_subclass_tuple():
 
     assert issubclass(int, (int, (float, int)))
     assert issubclass(str, (str, (Child, str)))
+
+
+def test_abstract_numbers_issubclass():
+    from numbers import Number, Integral, Complex, Real
+    assert issubclass(int, Number)
+    assert issubclass(int, Integral)
+    assert issubclass(int, Complex)
+
+    assert not issubclass(complex, Real)
+    assert issubclass(complex, Complex)

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/BuiltinFunctions.java

@@ -759,7 +759,7 @@ public boolean isSubclass(Object derived, PTuple clsTuple,
 
         @Fallback
         public boolean isSubclass(Object derived, Object cls) {
-            return derived == cls || isInstanceCheckInternal(derived, cls) || isSubtypeNode.execute(derived, cls);
+            return isInstanceCheckInternal(derived, cls) || isSubtypeNode.execute(derived, cls);
         }
     }