fetch: handle invalid priority values properly (#4522)

Author: Uzlopak

lib/web/fetch/request.js

@@ -1094,6 +1094,12 @@ webidl.converters.RequestInit = webidl.dictionaryConverter([
   {
     key: 'dispatcher', // undici specific option
     converter: webidl.converters.any
+  },
+  {
+    key: 'priority',
+    converter: webidl.converters.DOMString,
+    allowedValues: ['high', 'low', 'auto'],
+    defaultValue: () => 'auto'
   }
 ])
 

test/web-platform-tests/expectation.json

@@ -4131,8 +4131,7 @@
             },
             {
               "name": "new Request() throws a TypeError if any of RequestInit's members' values are invalid",
-              "success": false,
-              "message": "assert_throws_js: a new Request() must throw a TypeError if RequestInit's priority is an invalid value function \"() => {\n    new Request(\"\", {priority: 'invalid'});\n  }\" did not throw"
+              "success": true
             },
             {
               "name": "fetch() with a 'high' priority completes successfully",
@@ -4148,8 +4147,7 @@
             },
             {
               "name": "fetch() with an invalid priority returns a rejected promise with a TypeError",
-              "success": false,
-              "message": "assert_unreached: Should have rejected: undefined Reached unreachable code"
+              "success": true
             }
           ]
         },