Fix warnings in project

[joshuatbrown]

Fixes #771. I found that some of the warnings are false alarms, so those can't actually be fixed. Specifically, these are not real warnings:

No calls to throwing functions occur within 'try' expression

The other warnings are fixed.

[CLAassistant]

All committers have signed the CLA.

[martindsq]

Nice!

What Xcode version are you using? I recall seeing those warnings but they don't appear for me anymore and I updated it recently to 15.1.

You can add a label right here to mark this PR as "skips changelog" so the check doesn't fail.

Everything looks good to me.

[joshuatbrown]

What Xcode version are you using? I recall seeing those warnings but they don't appear for me anymore and I updated it recently to 15.1.

Thanks for the review, @martindsq! I'm using 15.1; not sure why the warnings appear for me and not you, but that's not too surprising to me. Xcode is just inconsistent sometimes.

[mplorentz]

Thanks Josh! I think some of these warnings were in the unit test target and would only show if you have run the unit tests after opening Xcode.

The No calls to throwing functions occur within 'try' expression is a long standing one that stresses me out. Basically multiple Swift Packages that we import define functions with the same name, and depending on the order they load in a different version can be used. What's worse is that the implementations aren't equivalent 😭 it caused a bug in the main target that I fixed somehow, but I couldn't get it fixed in the unit test target. I filed #777 to address these in the future.