Computing the global minimal model of an elliptic curve over a number field 
isomorphic to QQ...

sage: K.<t> = NumberField(x-1)
sage: E = EllipticCurve(K,[0,2])
sage: E.global_minimal_model()

... raises an unexpected TypeError:

TypeError: round() takes no arguments (1 given).

(Run on Sage 9.0, Linux Mint 19.2, 64 bit)
It's not dramatic as one can simply work over QQ and coerce, but I think 
the above code should also work and yield the same result, as sometimes it 
is convenient to treat QQ as an instance of NumberField. 

Thanks,
Benjamin

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