| ⇢ | A | zipline.pipeline.factors.Returns added |
| ⇢ | A | tests.pipeline.FactorTestCase.test_returns() added | |
| ⇢ | A | zipline.pipeline.factors.Returns.compute() added | |
| A | ↘ | B | zipline.pipeline.factors.unary_operator() got worse |
| B | ↘ | C | zipline.pipeline.factors.binary_operator() got worse |