Rationale: It was not removed in 1.4.0, so should not be removed now.
(cherry picked from commit 68fa6c03d92d8fa42ec9c4978c0a8e577775f292)
Polynomial classes and add some tests.
…e dtype pickle unless it has to. This will allow 1.4.x pickles to be compatible with 1.3.x pickles.
(cherry picked from commit 6078289d9c1e69c0b043e4bb2571caafb6b2910d)
…equal_nulp. (cherry picked from commit 6a7be0559ccfb24cf39fe1fe8a11232e18b0d26d)