feat: allow undefined values in URLSearchParams.ish (treated as '')

Author: battis

packages/requestish/src/URLSearchParams.ts

@@ -5,13 +5,19 @@ import { isJSONPrimitive, isString } from './isRecord.js';
 export type ish =
   | URLSearchParams
   | ConstructorParameters<typeof URLSearchParams>[0]
-  | Record<string, JSONPrimitive>;
+  | Record<string, JSONPrimitive | undefined>
+  | [string, JSONPrimitive | undefined][];
 
 export function from(search?: ish): URLSearchParams {
   if (search instanceof URLSearchParams) {
     return search;
   } else if (
-    isRecord<string, JSONPrimitive>(search, isString, isJSONPrimitive)
+    search &&
+    isRecord<string, JSONPrimitive | undefined>(
+      search,
+      isString,
+      isJSONPrimitive
+    )
   ) {
     return new URLSearchParams(
       Object.fromEntries(