message: Remove unnecessary max call in StarlarkStr::slice
diff: @@ -299,7 +299,8 @@ impl<'v> StarlarkValue<'v> for str {
  let s = if stop == len_chars {
  s
  } else {
  - fast_string::split_at(s, cmp::max(0, stop - start)).0
  + assert!(stop > start);
  + fast_string::split_at(s, stop - start).0
  };
  return Ok(heap.alloc_str(s));
  }
  