[issue26374] concurrent_futures Executor.map semantics better specified in docs

[Mark Dickinson]

Mark Dickinson added the comment:

Note also this code snippet from PEP 3148:

    for number, prime in zip(PRIMES, executor.map(is_prime,
                                                      PRIMES)):

The use of zip here suggests strongly that the intention is that the order of the `map` result is well-defined.

It's possible that the docs should be updated to make the ordering requirement clearer.

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