Prevent non decimal, non numerical, non negative entry of limit

ee/app/assets/javascripts/boards/components/board_settings_sidebar.vue

@@ -212,6 +212,9 @@ export default {
           :disabled="updating"
           :placeholder="$options.inputPlaceholderText"
           trim
+          number
+          type="number"
+          min="0"
           @input="handleWipLimitChange"
           @keydown.enter.native="onEnter"
           @blur="offFocus"

ee/spec/frontend/boards/components/board_settings_sidebar_spec.js

@@ -501,5 +501,19 @@ describe('BoardSettingsSideBar', () => {
         });
       });
     });
+
+    describe('passing of props to gl-form-input', () => {
+      beforeEach(() => {
+        createComponent({ activeListId: listId }, { updateListWipLimit: () => {} }, { edit: true });
+      });
+
+      it('passes `trim`', () => {
+        expect(wrapper.find(GlFormInput).attributes().trim).toBeDefined();
+      });
+
+      it('passes `number`', () => {
+        expect(wrapper.find(GlFormInput).attributes().number).toBeDefined();
+      });
+    });
   });
 });