feat: switch grisu2 float-to-string algorithm to hybrid of xjb & zmij algorithms

NOTICE

@@ -91,3 +91,14 @@ the following terms:
 
   Copyright (c) Arm Limited
   The MIT License (https://opensource.org/licenses/MIT)
+
+* xjb-as: https://github.com/JairusSW/xjb-as
+
+  The ECMAScript-compatible f64/f32 -> string (dtoa/ftoa) implementation in
+  std/assembly/util/dtoa.ts is vendored from xjb-as.
+
+  Copyright (c) Jairus Tanaka
+  Apache License, Version 2.0 (https://opensource.org/licenses/Apache-2.0)
+
+  xjb-as is itself derived from xjb (https://github.com/xjb714/xjb) and the
+  Zmij shortest-decimal core (https://github.com/vitaut/zmij).

package.json

@@ -79,9 +79,10 @@
     "build": "node scripts/build",
     "watch": "node scripts/build --watch",
     "coverage": "npx c8 -- npm test",
-    "test": "npm run test:parser && npm run test:compiler -- --parallel && npm run test:browser && npm run test:asconfig && npm run test:transform && npm run test:cli",
+    "test": "npm run test:parser && npm run test:compiler -- --parallel && npm run test:dtoa && npm run test:browser && npm run test:asconfig && npm run test:transform && npm run test:cli",
     "test:parser": "node --enable-source-maps tests/parser",
     "test:compiler": "node --enable-source-maps --no-warnings tests/compiler",
+    "test:dtoa": "node tests/dtoa",
     "test:browser": "node --enable-source-maps tests/browser",
     "test:asconfig": "cd tests/asconfig && npm run test",
     "test:transform": "npm run test:transform:esm && npm run test:transform:cjs",