How is the extend keyword to sqrt() of ring series supposed to be used?
I tried:

sage: K.<t> = PowerSeriesRing(QQ, 5)
sage: two = K(2)
sage: sqrt2 = two.sqrt(extend=True, name='sqrt2')       
sage: (t+sqrt2^2).sqrt()
---------------------------------------------------------------------------
NotImplementedError                       Traceback (most recent call last)


In any case I would expect the result to be

sqrt2 +sqrt2/4*t +sqrt2/32*t^2...

Regards,

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