edit: I just realized I missed the review window, my apologies for the noise.
original belated review
- What is your evaluation of the proposal?
Strong +1.
(I support the suggestion to refer to this less as "raw strings" and more as "customized delimiter/escape", to avoid confusion)
- Is the problem being addressed significant enough to warrant a change to Swift?
Yes, delimiter/escape control is the next logical extension to string literals and important to the language.
- Does this proposal fit well with the feel and direction of Swift?
This is the most Swifty solution to this problem I've seen. It generalizes delimiters/escapes into a simple and logical approach, while current syntax (common case) is just a zero-#.
This is an elegant extension, as @jrose mentioned. It was worth the wait and long threads to arrive at this solution.
- If you have used other languages or libraries with a similar feature, how do you feel that this proposal compares to those?
This compares favorably to any other approach I've seen. Delimiters are symmetric and balanced, escapes are obvious and supported. All this without requiring a new kind of literal.
- How much effort did you put into your review? A glance, a quick reading, or an in-depth study?
Reading of earlier iterations and relevant threads over the years, investigation of other languages.