Why is underscore permitted in the post type but dash is disallowed. Dash is the default character for permalinks. Post Types created using the underscore are not found! I fixed this by updating the validate-field function in core/content-types.php. My question is why is underscore permitted and dash disallowed? My second question is can you add support for dash so I don't need to patch this plugin on every upissue. Thanks in advance.