replace JSON.parseImmutable with links to the companion proposal

README.md

@@ -444,9 +444,7 @@ JSON.stringify(#[true, #{ a: #[1, 2, 3] }]); // '[true,{"a":[1,2,3]}]'
 
 ## JSON.parseImmutable
 
-We propose to add `JSON.parseImmutable` so we can extract a Record/Tuple type out of a JSON string instead of an Object/Array.
-
-The signature of `JSON.parseImmutable` is identical to `JSON.parse` with the only change being in the return type that is now a Record or a Tuple.
+Please see https://github.com/tc39/proposal-json-parseimmutable
 
 ## `Tuple.prototype`
 

cookbook/en.md

@@ -168,10 +168,7 @@ console.log(a === c); // false
 
 ### Parse
 
-```js
-const user = JSON.parseImmutable('{ "name": "danny", "admin": false, "score": 42 }');
-console.log(user === #{ name: "danny", admin: false, score: 42 });
-```
+Please see https://github.com/tc39/proposal-json-parseimmutable
 
 > Note: at the time of writing this, the playground does not support `JSON.parseImmutable`.
 
@@ -186,7 +183,17 @@ console.log(jsonUser); // {"admin":false,"name":"danny","score":42}
 
 ```js
 function recursiveRT(thing) {
-    return JSON.parseImmutable(JSON.stringify(thing));
+    function reviver(value) {
+        if (typeof value === 'object' && value !== null) {
+            if (Array.isArray(value)) {
+                return Tuple.from(value);
+            } else {
+                return Record(value);
+            }
+        }
+        return value;
+    }
+    return JSON.parse(JSON.stringify(thing), reviver);
 }
 
 const user = { name: "danny", stats: {
@@ -200,8 +207,6 @@ console.log(fixedUser === #{ name: "danny", stats: #{
 } }); // true
 ```
 
-> Note: at the time of writing this, the playground does not support `JSON.parseImmutable`.
-
 ## Array-like manipulations with Tuple by copy
 
 Using spread operations, `toReversed()`, `toSorted()`, `toSpliced()` or `with()` methods you can mutate tuples by copy:

spec.html

@@ -15,5 +15,4 @@
 <emu-import href="spec/expression.html"></emu-import>
 <emu-import href="spec/immutable-data-structures.html"></emu-import>
 <emu-import href="spec/fundamental-objects.html"></emu-import>
-<emu-import href="spec/structured-data.html"></emu-import>
 <emu-import href="spec/purely-editorial.html"></emu-import>