On: UTF-8 String Indexing Strategies

[chrismorgan]

I’m glad that Rust strings aren’t indexable by integer, but I think that making them indexable by range (of UTF-8 code unit offsets) was an error. `foo[0..10]` should have been `foo.slice(0..10)` or similar instead.

[the_mitsuhiko → chrismorgan]

It’s a bit of a footgun indeed but it’s quite handy in combination with the char index iterator.

[chrismorgan → the_mitsuhiko]

Sure, you do want to be able to index by code unit range, but it shouldn’t have been with the Index trait.

[zucker42 → chrismorgan]

There's no reason this couldn't be added now, though, right?