Reorder the SetPropertyValue overloads and constrain the bool and double overloads.

This avoids choosing the int overload for anything that can be implicitly converted to an integer.

unittests/test_propgridiface.py

@@ -16,6 +16,19 @@ class propgridiface_Tests(wtc.WidgetTestCase):
             iface = pg.PropertyGridInterface()
 
 
+    def test_propgridiface03(self):
+        # Ensure SetPropertyValue doesn't truncate floats
+        pgrid = pg.PropertyGrid(self.frame)
+        pgrid.Append(pg.FloatProperty('Float', value=123.456))
+
+        value = pgrid.GetPropertyValue('Float')
+        assert type(value) is float
+        assert value == 123.456
+
+        pgrid.SetPropertyValue('Float', 654.321)
+        value = pgrid.GetPropertyValue('Float')
+        assert type(value) is float
+        assert value == 654.321
 
 
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