In the driver's ErrorKind, we include variants that wrap errors from our dependencies, some of which are pre-1.0 and unstable. This means that if those dependencies make breaking changes to those error types, we will be unable to update the version that we depend on without a breaking change in the driver too. We should audit our API for places that we re-export unstable dependencies and replace them with stable types / types we control to avoid getting into a situation like that.