schema improvements: add additionalProperties: false to ensure closed types

lib/jsonschema/example-schema.json

@@ -1,5 +1,6 @@
 {
   "type": "object",
+  "additionalProperties": false,
   "properties": {
     "name": {
       "type": "string",
@@ -38,6 +39,7 @@
     },
     "services": {
       "type": "object",
+      "additionalProperties": false,
       "properties": {
         "opt": {
           "type": "string",

lib/jsonschema/test_parseOption.nix

@@ -278,6 +278,7 @@ in
       expr = slib.parseOption (evalType (lib.types.submodule subModule) { });
       expected = {
         type = "object";
+        additionalProperties = false;
         properties = {
           opt = {
             type = "boolean";
@@ -301,6 +302,7 @@ in
       expr = slib.parseOption (evalType (lib.types.submodule subModule) { });
       expected = {
         type = "object";
+        additionalProperties = false;
         properties = {
           opt = {
             type = "boolean";
@@ -331,6 +333,7 @@ in
         type = "object";
         additionalProperties = {
           type = "object";
+          additionalProperties = false;
           properties = {
             opt = {
               type = "boolean";
@@ -363,6 +366,7 @@ in
         type = "array";
         items = {
           type = "object";
+          additionalProperties = false;
           properties = {
             opt = {
               type = "boolean";

lib/jsonschema/test_parseOptions.nix

@@ -26,8 +26,10 @@ in
     {
       expr = slib.parseOptions evaled.options;
       expected = {
+        additionalProperties = false;
         properties = {
           foo = {
+            additionalProperties = false;
             properties = {
               bar = {
                 type = "boolean";