fix crash in test_fractions caused by doing float operation on boxed value
fix crash in test_fractions caused by doing float operation on boxed value

brettcannon/Pyjion,DinoV/Pyjion-1,Microsoft/Pyjion,DinoV/Pyjion-1,DinoV/Pyjion-1,brettcannon/Pyjion,Microsoft/Pyjion,DinoV/Pyjion-1,Microsoft/Pyjion,Microsoft/Pyjion,brettcannon/Pyjion