Plain text editor

Hi! One thing I really like about Markdown is that I can put separate parts of a sentence on separate lines, and the parser understands that I want it to all be one paragraph—you skip two lines for a new paragraph.

Is there any way to do that here? I understand everybody has a different workflow, and some people don’t like their whitespace getting messed with, but I would just feel a lot better if I knew the source I was editing was strictly markdown. Could there be a plaintext mode in the editor?