The goal here seems to be to have that "typewritery" look that people associate with writing drafts, but add a bit more readability than is possible in a monosp

The goal here seems to be to have that "typewritery" look that people associate with writing drafts, but add a bit more readability than is possible in a monospace font. Fair enough, though I'm not sure why having exactly two character widths is preferable to having three, or five, or simply designing a proportional font with wider typewriter-style characters. For programming, "duospace" works exactly like any other proportional font. The fact that some letters have the same width doesn't buy you anything in terms of alignment. Unless your style guide forbids the letters "m" and "w" in method names. ;)