[wip] jex and thinking about model thing on the jr thing"

jrx/src/model/model.ts

@@ -0,0 +1,40 @@
+/* idea: versioned state
+ *
+ * there is a version 0 state
+ *
+ * each state migration contains a migration from the previous version to the
+ * new version
+ *
+ * laws:
+ *
+ * - all version N states must map to valid version N+1 states
+ *
+ */
+
+export {
+    jr_version,
+    jr_state
+};
+
+let jr_version = 0;
+
+/**
+ * current state type for current version
+ */
+type jr_state = jr_0_state;
+
+/**
+ * All jr state types, historically
+ */
+type jr_n_state
+    = jr_0_state;
+
+/**
+ * This is the version 0 state
+ */
+type jr_0_state
+    = {version : 0,
+       keypair : keypair};
+
+type keypair
+    = {secretKey: Uint8Array