I see were you were downvoted, but I happen to see merit with your comment. Again, a lot of people make technical decisions without stepping back and just scanning their choices as non-specialist (in the context of their programming domain) and ask hey, does this make sense?
Technically all attributes are supposed to be surrounded by quotes regardless of how they're interpreted. That renders the premise of my whole comment invalid, to be "technically correct," so the people downvoting may have had that in mind.
Still, there are plenty of XML applications that leave out the quotes on numeric attributes. My point was really that they're not doing themselves any favors by abusing the spec that way. A text-based markup language is a great example of how premature optimization is unhelpful most of the time.
