Currently, we insert the final new line on each printer, 3rd party plugins need insert it too.

For embed print, normally this new line is not kept, 1 2 3 4.

If we move this to core.format, should make things easier.

To make this change none breaking, we can call stripTrailingHardline first in core.format.

Question: Is there language can't insert the final new line? If not, plugins should not be able to prevent this behavior, if there is, how to process?

Movitation