make sure that PyTrue and PyFalse are unique

Author: timfel

graalpython/com.oracle.graal.python.cext/src/abstract.c

@@ -54,7 +54,7 @@ static PyObject* null_error(void) {
 }
 
 int PyNumber_Check(PyObject *o) {
-    PyObject *result = truffle_invoke(PY_TRUFFLE_CEXT, "PyNumber_Check", to_java(o));
+    PyObject *result = to_sulong(truffle_invoke(PY_TRUFFLE_CEXT, "PyNumber_Check", to_java(o)));
     if(result == Py_True) {
     	return 1;
     }

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/runtime/object/PythonObjectFactory.java

@@ -201,9 +201,18 @@ public PythonNativeObject createNativeObjectWrapper(Object obj) {
     /*
      * Primitive types
      */
+    @CompilationFinal PInt pyTrue = null;
+    @CompilationFinal PInt pyFalse = null;
 
     public PInt createInt(boolean value) {
-        return trace(new PInt(lookupClass(PythonBuiltinClassType.Boolean), value ? BigInteger.ONE : BigInteger.ZERO));
+        if (value && pyTrue == null) {
+            CompilerDirectives.transferToInterpreterAndInvalidate();
+            pyTrue = new PInt(lookupClass(PythonBuiltinClassType.Boolean), BigInteger.ONE);
+        } else if (!value && pyFalse == null) {
+            CompilerDirectives.transferToInterpreterAndInvalidate();
+            pyFalse = new PInt(lookupClass(PythonBuiltinClassType.Boolean), BigInteger.ZERO);
+        }
+        return value ? pyTrue : pyFalse;
     }
 
     public PInt createInt(int value) {