This patch was authored by @grahamburgsma and released by @0xTim.
As EncodingError and DecodingError both conform to LocalizedError, error reporting uses their localizedDescription which is just a generic error message.
So this changes the error reporting from:
The operation could not be completed. The data isn’t in the correct format.
To a description much more useful (for example):
invalidValue(inf, Swift.EncodingError.Context(codingPath: [...], debugDescription: "Unable to encode Double.inf directly in JSON.", underlyingError: nil))