fix(search-params): if array values passed, first clear existing values

ensure override, rather than append

src/utils.ts

@@ -172,6 +172,8 @@ export function mergeSearchString(search: string, params: SetSearchParams) {
       merged.delete(key);
     } else {
       if (value instanceof Array) {
+        // Delete all instances of the key before appending
+        merged.delete(key);
         value.forEach(v => {
           merged.append(key, String(v));
         });

test/utils.spec.ts

@@ -136,6 +136,12 @@ describe("mergeSearchString should", () => {
     const actual = mergeSearchString("?foo=2&foo=3", { foo: [] });
     expect(actual).toBe(expected);
   });
+
+  test("return array containing only new value when current is present and new is an array with one value", () => {
+    const expected = "?foo=1&foo=2";
+    const actual = mergeSearchString("?foo=3&foo=4", { foo: [1, 2] });
+    expect(actual).toBe(expected);
+  });
 });
 
 describe("extractSearchParams should", () => {