Steps:

1. Go to Content/Content structure
2. Click Create and select Form
3. Click Create a form
4. Drag and drop Number
5. Go back

Actual result:

ezform displays error 500: Unable to transform value for property path "[fbf-6f8ceeea-dee8-2787-6569-e009fc898767]": Expected a numeric. [in vendor/symfony/symfony/src/Symfony/Component/Form/Form.php:1089]

Expected result:

Field Number should be validated after clicking back button just like Hidden field or it should be displayed like Single line input.