Officially add the initial state argument to speaker

speaker.js

@@ -2,24 +2,24 @@ class Speaker {
 	#callbacks = new Set()
 	#immediate
 	#scheduled = []
-	#current
+	#retain
 
-	constructor(immediate, current=[]) {
+	constructor(immediate, ...initial) {
 		this.#immediate = immediate
-		this.#current = current
+		this.#retain = initial
 	}
 
 	listen(callback) {
 		this.#callbacks.add(callback)
-		return this.#current
+		return this.#retain
 	}
 
 	speak(...args) {
-		this.#current = args
 		if (this.#immediate) {
 			for (let callback of this.#callbacks) {
 				callback(...args)
 			}
+			this.#retain = args
 		} else {
 			if (!this.#scheduled.length) {
 				queueMicrotask(() => {
@@ -27,6 +27,7 @@ class Speaker {
 						for (let callback of this.#callbacks) {
 							callback(...args)
 						}
+						this.#retain = args
 					}
 					this.#scheduled = []
 				})

speaker.md

@@ -6,7 +6,7 @@ Callbacks are scheduled as microtasks by default.
 ## Interface:
 
 ```
-Speaker(immediate=false)
+Speaker(immediate=false, ...initial)
 // Creates a new speaker.
 Speaker.listen(callback)
 // Registers a callback.
@@ -16,6 +16,9 @@ Speaker.silence(callback)
 // Removes a given callback
 ```
 
+The initial message is only used as the return value of `listen` before the
+first call to `speak`.
+
 ## Example
 
 A simple example: