Which of the following should we require for an object to be "supporting
the array interface"? Here a producer is something that supplies
array_struct or array_interface (where the latter is the Python level
version of the former as per recent messages). Consumers do something
with the results.
1. Producers can supply either array_struct (if implemented in C) or
array_interface (if implemented in Python). Consumers must accept
both.
2. Producers must supply both array_struct and array_interface.
Consumers may accept either.
3. Producers most supply both array_struct and array_interface.
Consumers must accept both as well.
A possibly related point, array_interface['data'] should be required to
be a buffer object; a 2-tuple of address/read-only should not be allowed
as that's a simple way to crash the interpreter.
I see some reasonable arguments for either 1 or 2. 3 seems like excess work.
-tim
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