default to packed mode

Author: sokra

lib/cache/FileCachePlugin.js

@@ -122,7 +122,7 @@ class FileCachePlugin {
 		const log = this.options.loglevel
 			? { debug: 4, verbose: 3, info: 2, warning: 1 }[this.options.loglevel]
 			: 0;
-		const store = this.options.store || "idle";
+		const store = this.options.store || "pack";
 
 		let pendingPromiseFactories = new Map();
 		const toHash = str => {