fix broken pseudo-states (they work more like regular transitions now)

src/statecharts/mtl/helpers.ts

@@ -0,0 +1,9 @@
+
+export function _evolve(object, changes) {
+  return Object.assign(
+    Object.create(Object.getPrototypeOf(object)), // create empty object with same prototype as original
+    {
+      ...object,
+      ...changes,
+    });
+}