rope: Implement `Rope::is_char_boundary` via chars bitmap (#40945)
Slightly more efficient. No new tests as we already have tests
verifiying this.
Release Notes:
- N/A *or* Added/Fixed/Improved ...
044701e3a5Lukas Wirth committed on 10/22/2025, 11:05:43 PM· committed by GitHubparenta96bf50