Bump crypto-bigint to v0.7.0-rc.22

[tarcieri]

Also bumps: rand_core v0.10.0-rc-6

This release brought a few breaking changes:

• For this crate's purposes: Unsigned => UnsignedMontyForm. I moved the associated type here, which has now been renamed MontyForm, because...
• Monty => MontyForm: the stack-allocated type previously known as MontyForm is now known as FixedMontyForm, and the Monty trait is now MontyForm.
• Monty(Form) methods that take a params argument now borrow: this gets rid of the params cloning that was happening before. It now clones (an Arc) for you, or copies, as need be.

Word of warning: as of this rand_core release, (Try)RngCore is now (Try)Rng. This crate wasn't impacted, however, since it uses CryptoRng which didn't change.

[tarcieri]

Note: the reason for the Unsigned => UnsignedMontyForm change was if we can decouple that particular associated type from Unsigned, it means we can (potentially, with a little work) impl Unsigned for Limb. And if we can do that, we can pass Limb as a generic argument bounded on Unsigned, and have it otherwise function as a single-limb Uint/UintRef-alike.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.71%. Comparing base (189a0e8) to head (cdb408c).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #110      +/-   ##
==========================================
+ Coverage   97.93%   98.71%   +0.78%     
==========================================
  Files          14       14              
  Lines        1891     1874      -17     
==========================================
- Hits         1852     1850       -2     
+ Misses         39       24      -15     

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[tarcieri]

@fjarri heads up, more breaking changes that could use an associated prerelease. Totally understand if you don't want to do that over the weekend though. Even having the PR/branch open is enough to unblock getting our downstream crates upgraded

[fjarri]

I must say, I did a double take at UnsignedMontyForm, seems like it would be better named UnsignedWithMontyForm.

[tarcieri]

@fjarri sure... can we rename it after the next breaking change? I've already released a bunch of elliptic curve crates which are already dependent on this release

[fjarri]

No problem. I know I should have mentioned it in the respective PR, but I unfortunately wasn't following the recent squall of changes closely. I'll merge this, do you need a new release?

[tarcieri]

@bogdan @fjarri thank you! And yes, a new release would be great!

[fjarri]

That's not me you're pinging :)

[tarcieri]

Whoops!

[tarcieri]

@fjarri also how about that release 😉

[fjarri]

Done.