AHC errors have bad .localizedDescription (always claims error 1)

[weissi]

I'm using a library that unfortunately does logger[metadataKey: "request.error"] = .string(error.localizedDescription) where the error is an error out of AHC. The result is that it always prints

request.error=The operation couldn’t be completed. (AsyncHTTPClient.HTTPClientError error 1.)

Note that error 1 is produced regardless of the actual error.

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The source of the problem is this oddity in Swift/Foundation:

import Foundation

struct MyError: Error & CustomStringConvertible { var description: String { "hello" } } 
print((MyError() as Error).localizedDescription)

// produces: "The operation couldn’t be completed. (MyError error 1.)"