perf: add truthProp util (#8522)

* perf: add TruthyProp util

* chore: rename

* chore: upd

src/collapse/Collapse.tsx

@@ -1,5 +1,5 @@
 import { PropType, defineComponent } from 'vue';
-import { createNamespace } from '../utils';
+import { truthProp, createNamespace } from '../utils';
 import { BORDER_TOP_BOTTOM } from '../utils/constant';
 import { useChildren } from '@vant/use';
 
@@ -16,6 +16,7 @@ export default defineComponent({
   name,
 
   props: {
+    border: truthProp,
     accordion: Boolean,
     modelValue: {
       type: [String, Number, Array] as PropType<
@@ -23,10 +24,6 @@ export default defineComponent({
       >,
       default: '',
     },
-    border: {
-      type: Boolean,
-      default: true,
-    },
   },
 
   emits: ['change', 'update:modelValue'],