Log primitive response values

node/README.md

@@ -8,3 +8,5 @@ If `type` is `tcp`, `port` and `host` are the host/port where to listen.
 
 ### Logging config
 `logging_keys` specifies which properties of RPC request & response objects to print in logs. Optional.
+
+A special-case logging key for responses is `value`, which enables logging responses that are primitives instead of objects.

node/src/client.js

@@ -1322,7 +1322,7 @@ export default class PeerClient {
 			logger(
 				`Response ${resp.id}:`,
 				this.#logObj(
-					resp.response,
+					resp.response instanceof Object ? resp.response : {value: resp.response},
 					success ? "success" : "failure",
 					this.loggingKeys.response
 				)