Called to implement evaluation of f[index]
f.__getitem_(index) <==> f[index]
>>> g = f[0] >>> g = f[-1:-4:-1] >>> g = f[2:2:2]
If index is an integer then a field is returned. If index is a slice then a field list is returned, which may be empty.
cf.FieldList.__contains__
cf.FieldList.__len__
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