make Js.Json.t use Boolean(bool) instead of explicit true/false (#6421)

* make Js.Json.t use Boolean(bool) instead of explicit true/false

* changelog

* move changelog entry to breaking changes

Author: zth

CHANGELOG.md

@@ -29,6 +29,7 @@
 
 #### :boom: Breaking Change
 - Add smart printer for pipe-chains.  https://github.com/rescript-lang/rescript-compiler/pull/6411 (the formatter will reformat existing code in certain cases)
+- `Js.Json.t` now uses `Boolean(bool)` instead of explicit `@as(true) True | @as(false) False`. https://github.com/rescript-lang/rescript-compiler/pull/6421
 
 #### :nail_care: Polish
 

jscomp/others/js_json.res

@@ -26,8 +26,7 @@
 
 @unboxed
 type rec t =
-  | @as(false) False
-  | @as(true) True
+  | Boolean(bool)
   | @as(null) Null
   | String(string)
   | Number(float)

jscomp/others/js_json.resi

@@ -32,8 +32,7 @@
 
 @unboxed /** The JSON data structure */
 type rec t =
-  | @as(false) False
-  | @as(true) True
+  | Boolean(bool)
   | @as(null) Null
   | String(string)
   | Number(float)