Ignore checked_conversions pedantic clippy lint

    warning: checked cast can be simplified
       --> src/fallback.rs:410:13
        |
    410 |     assert!(s.len() <= u32::MAX as usize);
        |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u32::try_from(s.len()).is_ok()`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#checked_conversions
        = note: `-W clippy::checked-conversions` implied by `-W clippy::pedantic`
        = help: to override `-W clippy::pedantic` add `#[allow(clippy::checked_conversions)]`

src/lib.rs

@@ -93,6 +93,7 @@
 #![allow(
     clippy::cast_lossless,
     clippy::cast_possible_truncation,
+    clippy::checked_conversions,
     clippy::doc_markdown,
     clippy::items_after_statements,
     clippy::iter_without_into_iter,