Re: [Numpy-discussion] NEP 30 - Duck Typing for NumPy Arrays - Implementation

I see what you mean now. It was my misunderstanding, I thought you wanted to return a call to __array__ when you call np.duckarray. I agree with your point and understand how the current text may be misleading, so we shall make it clearer in the NEP (as done in https://github.com/numpy/numpy/pull/14529) that both are valid ways: * Have a genuine implementation of __array__ (like Dask, as pointed out by Stephan); or * Raise an exception (as CuPy does). Thanks for opening the PR, I will comment there as well.