feat(runtime-dom): allow native Set as v-model checkbox source (#1957)

packages/shared/src/index.ts

@@ -58,6 +58,9 @@ export const hasOwn = (
 ): key is keyof typeof val => hasOwnProperty.call(val, key)
 
 export const isArray = Array.isArray
+export const isSet = (val: any): boolean => {
+  return toRawType(val) === 'Set'
+}
 export const isDate = (val: unknown): val is Date => val instanceof Date
 export const isFunction = (val: unknown): val is Function =>
   typeof val === 'function'

packages/shared/src/looseEqual.ts

@@ -51,3 +51,10 @@ export function looseEqual(a: any, b: any): boolean {
 export function looseIndexOf(arr: any[], val: any): number {
   return arr.findIndex(item => looseEqual(item, val))
 }
+
+export function looseHas(set: Set<any>, val: any): boolean {
+  for (let item of set) {
+    if (looseEqual(item, val)) return true
+  }
+  return false
+}