Potentially add `rethrows` to `over` and similar functions

[stackotter]

Context

I'm trying to update some code that I think could really benefit from a functional style. Here's the current code:

let keyPaths: [WritableKeyPath<Config, String>] // ...

for keyPath in keyPaths {
  config[keyPath: keyPath] = try evaluator.evaluateExpression(config[keyPath: keyPath])
}

The problem

I've tried a few different approaches and none of them compile because evaluateExpression is a throwing function, and the overture functions I'm trying to use don't have rethrows. Here's my best attempt:

let evaluators = keyPaths.map { over($0, evaluator.evaluateExpression) }

for evaluateField in evaluators {
  config = try evaluateField(config)
}

Potential solutions

1. I'm missing something and there's a better way to do this with a function that does have rethrows
2. Add rethrows to all of the methods except where it doesn't make sense (I feel like over and co make sense to have rethrows)