Add support for int(r) just like the other numeric classes.

Lib/rational.py

@@ -376,6 +376,8 @@ class Rational(RationalAbc):
         else:
             return a.numerator // a.denominator
 
+    __int__ = __trunc__
+
     def __floor__(a):
         """Will be math.floor(a) in 3.0."""
         return a.numerator // a.denominator

Lib/test/test_rational.py

@@ -160,6 +160,7 @@ class RationalTest(unittest.TestCase):
 
     def testConversions(self):
         self.assertTypedEquals(-1, trunc(R(-11, 10)))
+        self.assertTypedEquals(-1, int(R(-11, 10)))
         self.assertTypedEquals(-2, R(-11, 10).__floor__())
         self.assertTypedEquals(-1, R(-11, 10).__ceil__())
         self.assertTypedEquals(-1, R(-10, 10).__ceil__())