Squashed 'bundle/io/' changes from 59403be..eee10b3

eee10b3 removed unused variables
ae986c2 removed unused variables
78530aa Update iolib.js

git-subtree-dir: bundle/io
git-subtree-split: eee10b3e44461adba94cb472206c5b65d955034b
Merge commit 'de461e19158e58019a249a614aa45af93febbc5f'