RE: Allow non-matching input, but require confirmation

[Herbert Euler]

> 4) confirm-only = allow any non-matching input but require confirmation
>                   if the input is not a valid completion.

This strategy seems to encourage valid completions.  Namely, when
valid completions are avaliable and inputed, no confirmation is made.
Otherwise, confirmation is made.  If the input can complete to an
element of collection to make a valid completion, but is not a member
of collection, should we "encourage" the valid completion by
completing the input, or confirm the non-matching input as an invalid
completion?

Regards,
Guanpeng Xu

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