When differentiating elements of power series rings, I do not get the
expected result. Below is a minimal example:
R.<x> = PowerSeriesRing(SR)
f = 1 + O(x^2)
f.derivative(1)
f.derivative(2)
f.derivative(3)
The first derivative gives `O(x^1)` as expected and similarly the second
gives `O(x^0)`. However, the third derivative, rather than giving `O(x^0)`
again as expected, gives `O(x^{-1})`. Is this a bug or is this the desired
behaviour for some reason?
Note: as well as my local installation, I was able to reproduce this bug on
SageMath Cloud.
(I apologise if I'm doing something stupid as I'm only newly trying to
switch to Sage from Mathematica.)
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