Index: frontend/node_modules/klona/dist/index.js
===================================================================
--- frontend/node_modules/klona/dist/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/klona/dist/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,83 @@
+function klona(x) {
+	if (typeof x !== 'object') return x;
+
+	var k, tmp, str=Object.prototype.toString.call(x);
+
+	if (str === '[object Object]') {
+		if (x.constructor !== Object && typeof x.constructor === 'function') {
+			tmp = new x.constructor();
+			for (k in x) {
+				if (x.hasOwnProperty(k) && tmp[k] !== x[k]) {
+					tmp[k] = klona(x[k]);
+				}
+			}
+		} else {
+			tmp = {}; // null
+			for (k in x) {
+				if (k === '__proto__') {
+					Object.defineProperty(tmp, k, {
+						value: klona(x[k]),
+						configurable: true,
+						enumerable: true,
+						writable: true,
+					});
+				} else {
+					tmp[k] = klona(x[k]);
+				}
+			}
+		}
+		return tmp;
+	}
+
+	if (str === '[object Array]') {
+		k = x.length;
+		for (tmp=Array(k); k--;) {
+			tmp[k] = klona(x[k]);
+		}
+		return tmp;
+	}
+
+	if (str === '[object Set]') {
+		tmp = new Set;
+		x.forEach(function (val) {
+			tmp.add(klona(val));
+		});
+		return tmp;
+	}
+
+	if (str === '[object Map]') {
+		tmp = new Map;
+		x.forEach(function (val, key) {
+			tmp.set(klona(key), klona(val));
+		});
+		return tmp;
+	}
+
+	if (str === '[object Date]') {
+		return new Date(+x);
+	}
+
+	if (str === '[object RegExp]') {
+		tmp = new RegExp(x.source, x.flags);
+		tmp.lastIndex = x.lastIndex;
+		return tmp;
+	}
+
+	if (str === '[object DataView]') {
+		return new x.constructor( klona(x.buffer) );
+	}
+
+	if (str === '[object ArrayBuffer]') {
+		return x.slice(0);
+	}
+
+	// ArrayBuffer.isView(x)
+	// ~> `new` bcuz `Buffer.slice` => ref
+	if (str.slice(-6) === 'Array]') {
+		return new x.constructor(x);
+	}
+
+	return x;
+}
+
+exports.klona = klona;
Index: frontend/node_modules/klona/dist/index.min.js
===================================================================
--- frontend/node_modules/klona/dist/index.min.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/klona/dist/index.min.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,1 @@
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?t(exports):"function"==typeof define&&define.amd?define(["exports"],t):t(e.klona={})}(this,(function(e){e.klona=function e(t){if("object"!=typeof t)return t;var o,r,n=Object.prototype.toString.call(t);if("[object Object]"===n){if(t.constructor!==Object&&"function"==typeof t.constructor)for(o in r=new t.constructor,t)t.hasOwnProperty(o)&&r[o]!==t[o]&&(r[o]=e(t[o]));else for(o in r={},t)"__proto__"===o?Object.defineProperty(r,o,{value:e(t[o]),configurable:!0,enumerable:!0,writable:!0}):r[o]=e(t[o]);return r}if("[object Array]"===n){for(o=t.length,r=Array(o);o--;)r[o]=e(t[o]);return r}return"[object Set]"===n?(r=new Set,t.forEach((function(t){r.add(e(t))})),r):"[object Map]"===n?(r=new Map,t.forEach((function(t,o){r.set(e(o),e(t))})),r):"[object Date]"===n?new Date(+t):"[object RegExp]"===n?((r=new RegExp(t.source,t.flags)).lastIndex=t.lastIndex,r):"[object DataView]"===n?new t.constructor(e(t.buffer)):"[object ArrayBuffer]"===n?t.slice(0):"Array]"===n.slice(-6)?new t.constructor(t):t}}));
Index: frontend/node_modules/klona/dist/index.mjs
===================================================================
--- frontend/node_modules/klona/dist/index.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/klona/dist/index.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,81 @@
+export function klona(x) {
+	if (typeof x !== 'object') return x;
+
+	var k, tmp, str=Object.prototype.toString.call(x);
+
+	if (str === '[object Object]') {
+		if (x.constructor !== Object && typeof x.constructor === 'function') {
+			tmp = new x.constructor();
+			for (k in x) {
+				if (x.hasOwnProperty(k) && tmp[k] !== x[k]) {
+					tmp[k] = klona(x[k]);
+				}
+			}
+		} else {
+			tmp = {}; // null
+			for (k in x) {
+				if (k === '__proto__') {
+					Object.defineProperty(tmp, k, {
+						value: klona(x[k]),
+						configurable: true,
+						enumerable: true,
+						writable: true,
+					});
+				} else {
+					tmp[k] = klona(x[k]);
+				}
+			}
+		}
+		return tmp;
+	}
+
+	if (str === '[object Array]') {
+		k = x.length;
+		for (tmp=Array(k); k--;) {
+			tmp[k] = klona(x[k]);
+		}
+		return tmp;
+	}
+
+	if (str === '[object Set]') {
+		tmp = new Set;
+		x.forEach(function (val) {
+			tmp.add(klona(val));
+		});
+		return tmp;
+	}
+
+	if (str === '[object Map]') {
+		tmp = new Map;
+		x.forEach(function (val, key) {
+			tmp.set(klona(key), klona(val));
+		});
+		return tmp;
+	}
+
+	if (str === '[object Date]') {
+		return new Date(+x);
+	}
+
+	if (str === '[object RegExp]') {
+		tmp = new RegExp(x.source, x.flags);
+		tmp.lastIndex = x.lastIndex;
+		return tmp;
+	}
+
+	if (str === '[object DataView]') {
+		return new x.constructor( klona(x.buffer) );
+	}
+
+	if (str === '[object ArrayBuffer]') {
+		return x.slice(0);
+	}
+
+	// ArrayBuffer.isView(x)
+	// ~> `new` bcuz `Buffer.slice` => ref
+	if (str.slice(-6) === 'Array]') {
+		return new x.constructor(x);
+	}
+
+	return x;
+}