Consideration: change behavior in slug spaces to be replaced with dash instead of underscore.

[tw2113]

Origin: https://wordpress.org/support/topic/editing-url-slug-just-creates-a-new-cpt/

[tw2113]

We've had dash support for at least a few years. There's been lack of traction for demand to be dash by default when entering a space.

Going to close this as won't do at this time.