> * What is your evaluation of the proposal?

I support this. Currently this requires the use of unsafeBitCast, which works 
okay but is unwieldy.
I used unsafeBitCast to implement tagged pointers in a previous exploratory 
project, and I think this proposal would improve readability without being an 
inducement to recklessness.

“bitPattern” is a decent label, but that is also used for the lossy int-to-int 
conversions; pointer-to-int casting may be different enough to warrant a 
different label. “unsafeAddress” comes to mind, but may clash with the 
similarly-named function.


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

Yes.


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

Yes.


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

Like uintptr_t, this requires an intentional step in order to do bit operations 
on pointers.


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

A careful read and some experience trying this in swift.

Cheers,
Guillaume Lessard

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