> 
>       * What is your evaluation of the proposal?

The IUO is not a transitional technology, as it is essential to bridge from 
languages from which Swift evolved, such as C and Objective-C. The proposal 
doesn't give much consideration to this application of IUOs, and hence, I 
cannot support the proposal in its current state.

>       * Is the problem being addressed significant enough to warrant a change 
> to Swift?

Grant it, the use of IUO outside of bridging is strange and probably a poor 
practice. However, there seems to exist a requirement and this proposal would 
make satisfying this requirement more difficult.

>       * Does this proposal fit well with the feel and direction of Swift?

No.

>       * If you have you used other languages or libraries with a similar 
> feature, how do you feel that this proposal compares to those?

Not applicable.

>       * How much effort did you put into your review? A glance, a quick 
> reading, or an in-depth study?

In-depth study.

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