RFC: Do not sanitize error messages with Unexpected Server Error on the client if the error class has a property skipReactRouterSanitize: true

[remorses]

Right now all server error messages are sanitized here:

react-router/packages/react-router/lib/server-runtime/errors.ts

Line 48 in b4c3d7c

export function sanitizeError<T = unknown>(error: T, serverMode: ServerMode) {

I would like to preserve some error messages so that the message can be used in the client. This can be done with custom Error classes with a field skipReactRouterSanitize

class KnownError extends Error {
   skipReactRouterSanitize = true
}