Convert to float for comparison with float in IFDRational __eq__

Tests/test_tiff_ifdrational.py

@@ -28,6 +28,8 @@ def test_sanity():
     _test_equal(1, 2, Fraction(1, 2))
     _test_equal(1, 2, IFDRational(1, 2))
 
+    _test_equal(7, 5, 1.4)
+
 
 def test_ranges():
     for num in range(1, 10):

src/PIL/TiffImagePlugin.py

@@ -354,9 +354,12 @@ class IFDRational(Rational):
         return self._val.__hash__()
 
     def __eq__(self, other):
+        val = self._val
         if isinstance(other, IFDRational):
             other = other._val
-        return self._val == other
+        if isinstance(other, float):
+            val = float(val)
+        return val == other
 
     def __getstate__(self):
         return [self._val, self._numerator, self._denominator]