Further simplification enabled by chained conversions

[kazcw]

Pull Request Description

Some simplification enabled by the refactor in #11671. Inspired by review from @JaroslavTulach.

Important Notes

Checklist

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[farmaazon]

I see only one usage of into_u8: in ModifiedPrecedence::new; there's no docs, and I don't know why 0x7f is not allowed.

[kazcw]

It's unlikely we would ever want to use high numeric values for these, but out of an abundance of caution I put a note here to make sure that anyone considering doing so knows what that could affect. If they are really determined to make that sort of change, the reference to into_u8 points them in the right direction to find out why they can't use 0x7f.

[JaroslavTulach]

Have I provided a useful review for Rust code!?

[farmaazon]

Have I provided a useful review for Rust code!?

I assume what you want to say is that you don't need to be owner of rust parser code.

You were added long ago c525b20 by @kazcw ; I guess you may freely unsubscribe from it.

[kazcw]

Have I provided a useful review for Rust code!?

😆 This isn't the first time you've made some good points--at this point you're a bona fide Rustacean. As a Rust developer, when you have to work in Java do you miss the zero-cost abstractions?