TST: verify we can add and subtract from indices (#8142) #16629
Merged
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This just provides a validating test that some basic arithmetic on int64 and float64 indices works, and in particular that things like
pd.Int64Index([1, 2]) - 1
no longer raiseException: Input must be iterable!
.Should be able to close #8142, which in practice hasn't been applicable for a long time.