diff --git a/package.json b/package.json
index 4ded060..85f2ec5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "goshawkdb",
-  "version": "0.2.3",
+  "version": "0.2.4",
   "description": "A javascript client for goshawkdb.",
   "main": "./index.js",
   "scripts": {
diff --git a/src/connection.js b/src/connection.js
index 26c72bb..62cd161 100644
--- a/src/connection.js
+++ b/src/connection.js
@@ -19,7 +19,7 @@ class Connection {
 		/** @private used in logging to distinguish different connections */
 		this.connectionId = (nextConnectionNumber++)
 		/** @private */
-		this.link = new MsgpackConnection(url, ("000" + this.connectionId).substr(-3))
+		this.link = new MsgpackConnection(url, ("000" + this.connectionId).slice(-3))
 
 		/**
 		 * The product and version information we sent to the server during the initial connection handshake.
@@ -93,7 +93,7 @@ class Connection {
 			// now we're properly connected
 			this.messageHandler = null
 			this.cache = new ObjectCache(this.namespace)
-			console.info(`Connection ${this.connectionId}: Connected to goshawkdb.`, this.serverInfo, this.clientInfo, this.namespace, this.roots)
+			console.info("Connection %s: Connected to goshawkdb.", this.connectionId, this.serverInfo, this.clientInfo, this.namespace, this.roots)
 			this._onConnectionNegotiated(this)
 		}
 
@@ -113,8 +113,11 @@ class Connection {
 						console.warn(`Connection ${this.connectionId}: No handler found for message`, data)
 					}
 				},
-				// on end - if the connection stops for any reason (error, or deliberate) before it resolves then it rejects.
-				(e) => reject(e),
+				// on end - if the connection stops for any reason (error, or deliberate).
+				(e) => {
+					reject(e)
+					this.onclose(e)
+				},
 				// on open we start the handshake by sending the client info.
 				() => this.link.send(this.clientInfo),
 				connectionOptions
@@ -122,6 +125,12 @@ class Connection {
 		})
 	}
 
+	/**
+	 * A callback that can be set to be told when the connection closes, either in error, or deliberately.
+	 * @param closeEvent the websocket event explaining why the connection has closed.
+	 */
+	onclose(closeEvent) {}
+
 	/**
 	 * Queues a transaction for running, then ensures that transaction processing is happening.
 	 * The returned promise resolves with the value returned by the fn once the transaction has committed.  The fn may be
diff --git a/src/errors.js b/src/errors.js
index 269da0a..89b40d7 100644
--- a/src/errors.js
+++ b/src/errors.js
@@ -3,11 +3,15 @@ exports.Throwable = class Throwable extends Error {
 	/** @param {string} message a human readable description of this error. */
 	constructor(message) {
 		super(message)
-		/** the type of this error.
-		 * @type {string} */
+		/**
+		 * The type of this error.
+		 * @type {string}
+		 */
 		this.name = this.constructor.name
-		/** human readable description of this error.
-		 * @type {string} */
+		/**
+		 * Human readable description of this error.
+		 * @type {string}
+		 */
 		this.message = message
 	}
 }
diff --git a/src/msgpack-connection.js b/src/msgpack-connection.js
index e4b1c6a..be7503e 100644
--- a/src/msgpack-connection.js
+++ b/src/msgpack-connection.js
@@ -15,11 +15,11 @@ class MsgpackConnection {
 			codec: msgpack.createCodec({binarraybuffer: true})
 		}
 		// all the callbacks!
-		this.onOpen = null
-		this.onEnd = null
-		this.onMessage = null
-		this.onClose = null
-		this.onError = null
+		this.onOpen = noop
+		this.onEnd = noop
+		this.onMessage = noop
+		this.onClose = noop
+		this.onError = noop
 	}
 
 	connect(onMessage, onEnd, onOpen, connectionOptions) {
@@ -30,43 +30,32 @@ class MsgpackConnection {
 		this.onEnd = onEnd
 		this.onOpen = onOpen
 		const websocket = this.websocket = new WebSocket(this.url, undefined, connectionOptions)
-		websocket.binaryType = 'arraybuffer'
-		websocket.onopen = (evt) => {
-			console.debug(`Connection ${this.connectionLabel}: Connection Open`)
-			if (this.onOpen) {
+		Object.assign(websocket, {
+			binaryType: 'arraybuffer',
+			onopen: (evt) => {
+				console.debug("Connection %s: Connection Open", this.connectionLabel)
 				this.onOpen(evt)
-			}
-		}
-		websocket.onclose = (evt) => {
-			console.debug(`Connection ${this.connectionLabel}: Connection Closed`, evt.code, evt.reason)
-			if (this.onEnd) {
+			},
+			onclose: (evt) => {
+				console.debug("Connection %s: Connection Closed", this.connectionLabel, evt.code, evt.reason)
 				this.onEnd(evt)
-			}
-			if (this.onClose) {
 				this.onClose(evt)
-			}
-		}
-		websocket.onerror = (evt) => {
-			console.error(`Connection ${this.connectionLabel}: Connection Error`, evt.code, evt.reason)
-			if (this.onEnd) {
+			},
+			onerror: (evt) => {
+				console.error("Connection %s: Connection Error", this.connectionLabel, evt.code, evt.reason)
 				this.onEnd(evt)
-			}
-			if (this.onError) {
 				this.onError(evt)
-			}
-		}
-		websocket.onmessage = (messageEvent) => {
-			const data = msgpack.decode(new Uint8Array(messageEvent.data));
-			console.debug(`${this.connectionLabel} <`, data)
-
-			if (this.onMessage) {
+			},
+			onmessage: (messageEvent) => {
+				const data = msgpack.decode(new Uint8Array(messageEvent.data));
+				console.debug("%s <", this.connectionLabel, data)
 				this.onMessage(data)
 			}
-		}
+		})
 	}
 
 	send(message) {
-		console.debug(`${this.connectionLabel} >`, message)
+		console.debug("%s >", this.connectionLabel, message)
 		this.websocket.send(msgpack.encode(message, this.options))
 	}
 
@@ -99,3 +88,5 @@ class MsgpackConnection {
 }
 
 module.exports = MsgpackConnection
+
+function noop() {}
\ No newline at end of file
diff --git a/src/objectcache.js b/src/objectcache.js
index d1c686f..e2b682a 100644
--- a/src/objectcache.js
+++ b/src/objectcache.js
@@ -135,8 +135,8 @@ class ObjectCacheEntry {
 	}
 
 	create(value, refs) {
-		if (value instanceof ArrayBuffer != true) {
-			throw new TypeError("values should be array buffers : " + value)
+		if (value instanceof ArrayBuffer !== true) {
+			throw new TypeError("Values should be array buffers : " + value)
 		}
 		checkRefs(refs)
 		this.hasBeenCreated = true
diff --git a/src/uint64.js b/src/uint64.js
index ff8db7a..c47afd4 100644
--- a/src/uint64.js
+++ b/src/uint64.js
@@ -10,24 +10,26 @@ class Uint64 {
 	 */
 	constructor(uintArray = new Uint8Array(8)) {
 		if (uintArray instanceof Uint8Array === false) {
-			throw new TypeError("Uint64 source must be a Uint8Array, Uint64.from(bytes), Uint64.fromTypedArray, Uint64.fromArrayBuffer might suit your needs better.")
+			throw new TypeError("Uint64 source must be a Uint8Array. Uint64.from(bytes), Uint64.fromTypedArray, Uint64.fromArrayBuffer might suit your needs better.")
 		}
 		/**
 		 * @private
 		 * @type {Uint8Array}
 		 */
 		this.data = uintArray
+	}
 
-		/**
-		 * An arraybuffer representation of this value.
-		 * @type {ArrayBuffer}
-		 */
-		this.buffer = this.data.buffer
+	/**
+	 * An arraybuffer representation of this value.
+	 * @type {ArrayBuffer}
+	 */
+	get buffer() {
+		return this.data.buffer
 	}
 
 	/**
 	 * Creates a Uint64 from bytes
-	 * @param {number[]} bytes
+	 * @param {...number} bytes the byte values to initialise a new Uint64 with.  Only the last 8 bytes are taken.
 	 * @returns {Uint64}
 	 */
 	static from(...bytes) {
@@ -82,8 +84,8 @@ class Uint64 {
 	}
 
 	/**
-	 * Set the last last bytes.length bytes.
-	 * @param {number[]} bytes the bytes to set.
+	 * Set the last bytes.length bytes.
+	 * @param {...number} bytes the bytes to set.
 	 */
 	set(...bytes) {
 		if (bytes[0] instanceof Uint64) {
@@ -96,7 +98,7 @@ class Uint64 {
 	}
 
 	/**
-	 * Returns an array buffer where this Uint64 is the first 8 bytes and
+	 * Returns a new array buffer where this Uint64 is the first 8 bytes and
 	 * the passed buffer is the subsequent bytes.
 	 * @param {ArrayBuffer|Buffer|TypedArray} buffer the subsequent bytes.
 	 * @returns {ArrayBuffer}
@@ -110,7 +112,7 @@ class Uint64 {
 	}
 
 	/**
-	 * A string representation of this Uint64.  This string representation is for debugging purposes
+	 * A string representation of this Uint64.  The exact string representation is for debugging purposes
 	 * and does not form part of the public API.
 	 */
 	toString() {