Merge pull request #2455 from baiyaaaaa/feat-collapse

support collapse value type(fix #2452)

packages/collapse/src/collapse.vue

@@ -12,7 +12,7 @@
     props: {
       accordion: Boolean,
       value: {
-        type: [Array, String],
+        type: [Array, String, Number],
         default() {
           return [];
         }