Hmm, I see the logic there. I mainly included it because that is how we have mostly done it so far, and also how other style guides seem to have adopted:
http://google-styleguide.googlecode.com/svn/trunk/javascriptguide.xml?showone=Code_formatting#Code_formatting
https://github.com/rwaldron/idiomatic.js/#spacing

Although looking through the edetail-lib, it's not consistent.