Swapping null for '' as an interim fix for an erroneous null va…

…lue which collides with `remove()` - lack of time / this'll solve it for now; no negative impact on `bench-lru` results

lib/tiny-lru.es6.js

@@ -5,12 +5,13 @@
  * @copyright 2018
  * @license BSD-3-Clause
  * @link https://github.com/avoidwork/tiny-lru
- * @version 1.5.0
+ * @version 1.5.1
  */
 "use strict";
 
 (function (global) {
-	const next = typeof process !== "undefined" ? process.nextTick : arg => setTimeout(arg, 1);
+	const next = typeof process !== "undefined" ? process.nextTick : arg => setTimeout(arg, 1),
+		empty = "";
 
 	class LRU {
 		constructor (max, notify, ttl) {
@@ -108,7 +109,7 @@
 						this.first = cached.previous;
 					}
 				} else if (this.first === key) {
-					this.first = null;
+					this.first = empty;
 				}
 
 				if (this.has(cached.next)) {
@@ -118,15 +119,15 @@
 						this.last = cached.next;
 					}
 				} else if (this.last === key) {
-					this.last = null;
+					this.last = empty;
 				}
 			} else {
 				if (this.first === key) {
-					this.first = null;
+					this.first = empty;
 				}
 
 				if (this.last === key) {
-					this.last = null;
+					this.last = empty;
 				}
 			}
 
@@ -143,8 +144,8 @@
 			}
 
 			this.cache = {};
-			this.first = null;
-			this.last = null;
+			this.first = empty;
+			this.last = empty;
 			this.length = 0;
 			this.timers = {};
 
@@ -157,13 +158,13 @@
 			if (this.has(key)) {
 				item = this.cache[key];
 				item.value = value;
-				item.next = null;
+				item.next = empty;
 
 				if (this.first !== key) {
 					item.previous = this.first;
 				}
 
-				if (this.last === key && item.previous !== null) {
+				if (this.last === key && item.previous !== empty) {
 					this.last = item.previous;
 				}
 			} else {
@@ -176,7 +177,7 @@
 				}
 
 				this.cache[key] = {
-					next: null,
+					next: empty,
 					previous: this.first,
 					value: value
 				};
@@ -187,7 +188,7 @@
 				first.next = key;
 
 				if (first.previous === key) {
-					first.previous = null;
+					first.previous = empty;
 				}
 			}
 

lib/tiny-lru.js

@@ -5,7 +5,7 @@
  * @copyright 2018
  * @license BSD-3-Clause
  * @link https://github.com/avoidwork/tiny-lru
- * @version 1.5.0
+ * @version 1.5.1
  */
 "use strict";
 
@@ -16,7 +16,8 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 (function (global) {
 	var next = typeof process !== "undefined" ? process.nextTick : function (arg) {
 		return setTimeout(arg, 1);
-	};
+	},
+	    empty = "";
 
 	var LRU = function () {
 		function LRU(max, notify, ttl) {
@@ -134,7 +135,7 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 							this.first = cached.previous;
 						}
 					} else if (this.first === key) {
-						this.first = null;
+						this.first = empty;
 					}
 
 					if (this.has(cached.next)) {
@@ -144,15 +145,15 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 							this.last = cached.next;
 						}
 					} else if (this.last === key) {
-						this.last = null;
+						this.last = empty;
 					}
 				} else {
 					if (this.first === key) {
-						this.first = null;
+						this.first = empty;
 					}
 
 					if (this.last === key) {
-						this.last = null;
+						this.last = empty;
 					}
 				}
 
@@ -174,8 +175,8 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 				}
 
 				this.cache = {};
-				this.first = null;
-				this.last = null;
+				this.first = empty;
+				this.last = empty;
 				this.length = 0;
 				this.timers = {};
 
@@ -190,13 +191,13 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 				if (this.has(key)) {
 					item = this.cache[key];
 					item.value = value;
-					item.next = null;
+					item.next = empty;
 
 					if (this.first !== key) {
 						item.previous = this.first;
 					}
 
-					if (this.last === key && item.previous !== null) {
+					if (this.last === key && item.previous !== empty) {
 						this.last = item.previous;
 					}
 				} else {
@@ -209,7 +210,7 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 					}
 
 					this.cache[key] = {
-						next: null,
+						next: empty,
 						previous: this.first,
 						value: value
 					};
@@ -220,7 +221,7 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
 					first.next = key;
 
 					if (first.previous === key) {
-						first.previous = null;
+						first.previous = empty;
 					}
 				}