feat: add "json" mode;

- for JSON values only!
- 240B // 330-340k op/s

Author: lukeed

Diff for: .gitignore

@@ -5,4 +5,5 @@ node_modules
 *.log
 
 /dist
+/json
 /lite

Diff for: package.json

@@ -18,6 +18,7 @@
     "dist"
   ],
   "modes": {
+    "json": "src/json.js",
     "default": "src/index.js",
     "lite": "src/lite.js"
   },

Diff for: src/json.js

@@ -0,0 +1,28 @@
+export function klona(val) {
+	var k, out, tmp;
+
+	if (Array.isArray(val)) {
+		out = Array(k=val.length);
+		while (k--) out[k] = (tmp=val[k]) && typeof tmp === 'object' ? klona(tmp) : tmp;
+		return out;
+	}
+
+	if (Object.prototype.toString.call(val) === '[object Object]') {
+		out = {}; // null
+		for (k in val) {
+			if (k === '__proto__') {
+				Object.defineProperty(out, k, {
+					value: klona(val[k]),
+					configurable: true,
+					enumerable: true,
+					writable: true,
+				});
+			} else {
+				out[k] = (tmp=val[k]) && typeof tmp === 'object' ? klona(tmp) : tmp;
+			}
+		}
+		return out;
+	}
+
+	return val;
+}