dcbd5f5134
Add unicode fast path to `is_printable` Before, it would enter the full expensive check even for normal ascii characters. Now, it skips the check for the ascii characters in `32..127`. This range was checked manually from the current behavior. I ran the `tracing` test suite in miri, and it was really slow. I looked at a profile, and miri spent most of the time in `core::char::methods::escape_debug_ext`, where half of that was dominated by `core::unicode::printable::is_printable`. So I optimized it here. The tracing profile:  |
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| .. | ||
| benches | ||
| primitive_docs | ||
| src | ||
| tests | ||
| Cargo.toml | ||
