perf(webidl): optimize createDictionaryConverter() (#12279)

On a benchmark constructing Responses with headers this shaves off 25%
denoland · Oct 4, 2021 · fec0f1c · fec0f1c
1 parent c79fd8f
commit fec0f1c
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/ext/webidl/00_webidl.js b/ext/webidl/00_webidl.js
@@ -41,6 +41,7 @@
  NumberMAX_SAFE_INTEGER,
  // deno-lint-ignore camelcase
  NumberMIN_SAFE_INTEGER,
+ ObjectAssign,
  ObjectCreate,
  ObjectDefineProperties,
  ObjectDefineProperty,
@@ -726,7 +727,7 @@
  }
  const esDict = V;
 
- const idlDict = { ...defaultValues };
+ const idlDict = ObjectAssign({}, defaultValues);
 
  // NOTE: fast path Null and Undefined.
  if ((V === undefined || V === null) && !hasRequiredKey) {