Custom Status

It looks like WordPress does not have a way to limit a post status to a specific post type. If a new post status is registered to be used with a custom post type, it will also be available to regular post and page post types.

For example, when you ask WordPress for the statuses available for a post, it returns the following:

• publish
• future
• draft
• pending
• private
• trash
• auto-draft
• inherit
• request-pending
• request-confirmed
• request-failed
• request-completed

The last four statuses are for the Personal Data Requests (user_request), not posts.

I would very much like to implement support for custom statuses without displaying these status for post types that they are not related to. I need to think through what the downside would be for showing these statuses for all post types.