func RestoreDefaultErrorBody() errors.ErrorOption {
	return errors.SetData(errorBody, nil)
}
RestoreDefaultErrorBody returns an ErrorOption (for use in ErrorClass
creation or error instantiation) that restores the default error body shown
by GetErrorBody for some subhierarchy of errors.
package errhttp
import (
	"fmt"
	"github.com/spacemonkeygo/errors"
)
var (
	statusCode = errors.GenSym()
	errorBody  = errors.GenSym()
)
func SetStatusCode(code int) errors.ErrorOption {
	return errors.SetData(statusCode, code)
}
func OverrideErrorBody(message string) errors.ErrorOption {
	return errors.SetData(errorBody, message)
}