WIP: initial prototype

- Added support for request timeout
- Improved deserializer
- Fixed minor bugs
- Fixed typos

lib/ConnectionPool.js

@@ -10,7 +10,8 @@ class ConnectionPool {
     this.alive = []
     this.dead = []
     this.selector = opts.selector
-    this.sll = opts.sll
+    this._ssl = opts.ssl
+    this._agent = opts.agent
     // the resurrect timeout is 60s
     // we multiply it by 2 because the resurrect formula is
     // `Math.pow(resurrectTimeout * 2, deadCount -1)`
@@ -143,12 +144,17 @@ class ConnectionPool {
     if (typeof opts === 'string') {
       opts = this.urlToHost(opts)
     }
-    Object.assign(opts, this.ssl)
+    if (opts.ssl == null) opts.ssl = this._ssl
+    if (opts.agent == null) opts.agent = this._agent
+
     const connection = new Connection(opts)
     debug('Adding a new connection', connection)
+    if (this.connections.has(connection.id)) {
+      throw new Error(`Connection with id '${connection.id} is already present`)
+    }
     this.connections.set(connection.id, connection)
     this.alive.push(connection.id)
-    return this
+    return connection
   }
 
   /**