fix: remove nullish params when resolving

packages/router/__tests__/router.spec.ts

@@ -297,20 +297,25 @@ describe('Router', () => {
     expect(router.currentRoute.value).toMatchObject({ params: { p: '0' } })
   })
 
-  it('casts null/undefined params to empty strings', async () => {
+  it('removes null/undefined params', async () => {
     const { router } = await newRouter()
-    expect(
-      router.resolve({ name: 'optional', params: { p: undefined } })
-    ).toMatchObject({
-      params: {},
+
+    const route1 = router.resolve({
+      name: 'optional',
+      params: { p: undefined },
     })
-    expect(
-      router.resolve({ name: 'optional', params: { p: null } })
-    ).toMatchObject({
-      params: {},
+    expect(route1.path).toBe('/optional')
+    expect(route1.params).toEqual({})
+
+    const route2 = router.resolve({
+      name: 'optional',
+      params: { p: null },
     })
+    expect(route2.path).toBe('/optional')
+    expect(route2.params).toEqual({})
+
     await router.push({ name: 'optional', params: { p: null } })
-    expect(router.currentRoute.value).toMatchObject({ params: {} })
+    expect(router.currentRoute.value.params).toEqual({})
     await router.push({ name: 'optional', params: {} })
   })
 

packages/router/src/router.ts

@@ -491,7 +491,7 @@ export function createRouter(options: RouterOptions): Router {
       }
       // pass encoded values to the matcher, so it can produce encoded path and fullPath
       matcherLocation = assign({}, rawLocation, {
-        params: encodeParams(rawLocation.params),
+        params: encodeParams(targetParams),
       })
       // current location params are decoded, we need to encode them in case the
       // matcher merges the params