perf(ext/fetch): skip USVString webidl conv on string constructor (#12168)

* perf(ext/fetch): skip USVString webidl conv on string constructor
* Rename webidl convert to RequestInfo_DOMString

To disambiguate and hint that it normalizes to DOMString instead of USVString since DOMString => USVString is handled by `op_url_parse` when calling `new URL(...)`

1 files changed, 4 insertions, 3 deletions

diff --git a/ext/fetch/23_request.js b/ext/fetch/23_request.js
index 36c63db2a..51ea9b3bc 100644
--- a/ext/fetch/23_request.js
+++ b/ext/fetch/23_request.js
@@ -220,7 +220,7 @@
     constructor(input, init = {}) {
       const prefix = "Failed to construct 'Request'";
       webidl.requiredArguments(arguments.length, 1, { prefix });
-      input = webidl.converters["RequestInfo"](input, {
+      input = webidl.converters["RequestInfo_DOMString"](input, {
         prefix,
         context: "Argument 1",
       });
@@ -424,14 +424,15 @@
     "Request",
     Request,
   );
-  webidl.converters["RequestInfo"] = (V, opts) => {
+  webidl.converters["RequestInfo_DOMString"] = (V, opts) => {
     // Union for (Request or USVString)
     if (typeof V == "object") {
       if (V instanceof Request) {
         return webidl.converters["Request"](V, opts);
       }
     }
-    return webidl.converters["USVString"](V, opts);
+    // Passed to new URL(...) which implictly converts DOMString -> USVString
+    return webidl.converters["DOMString"](V, opts);
   };
   webidl.converters["RequestRedirect"] = webidl.createEnumConverter(
     "RequestRedirect",