Remove FunctionChain.__getitem__
This has unintended sideeffects* and is not necessary since the functions
attribute is exposed.
*For example, np.array([chain])
produces an array with each function in
chain as an individual element.
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This has unintended sideeffects* and is not necessary since the functions
attribute is exposed.
*For example, np.array([chain])
produces an array with each function in
chain as an individual element.