Cast casts Multi error (if any) to error and returns it if err is already nil or not Multi type Cast will just return it the returned error is safe to use in any std error evaluations, such as if err == nil, etc.

NewMulti returns new Multi error populated with errs, if any.

Client APIs should raise ErrNotFound to indicate that a resource requested in a get/read does not exist.

ClientInitError is a custom Go error type to indicate that initializing a client connection to a service failed.

Multi error implementation.