proposal: x/exp/jsonrpc2: allow JSON-RPC2 response errors to be exploitable #56133
Description
jsonrpc2.wireError type is not exported, but contains useful information.
As jsonrpc2.AsyncCall.Await() returns an error, when a JSON-RPC2 error is returned by the server side, it is not possible for the caller to guess it is really a server error and also to access data it contains.
The proposal is simply to rename jsonrpc2.wireError to jsonrpc2.Error as done in https://go-review.googlesource.com/c/exp/+/415615
This way the caller can do a type assertion to check it is a server error, and then access the already exported fields.
The backward compatibility is not broken as the previous jsonrpc2.wireError type was not exported.