How'd you get the 7kb size for choo? Looks like ~31kb after uglify, ~11kb after gzip. p.s. ~35% of that is just the "assert" module 
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So a bunch of transforms basically. Docs: https://github.com/yoshuawuyts/choo#how-can-i-optimize-choo … | Code: https://github.com/yoshuawuyts/choo/blob/master/scripts/test-size …
it's going to be dropping to ~5kb soon btw ^___^ - just gotta get https://github.com/shama/yo-yoify working :D