MAINT: Older pandas ignored this, so let's keep existing behavior (from new-new-new f56aa795ae84e7b01ffdab43aa8adde788b89e93)
MAINT: Older pandas ignored this, so let's keep existing behavior (from new-new-new f56aa795ae84e7b01ffdab43aa8adde788b89e93)

humdings/zipline,humdings/zipline