initial support for set()/get() extending
getting under 4k, one byte at a time
some more bytes saved
more size optimizations
full version is <8k
new param added to up() so it orks like next(). Size also goes down
because it's easier to compress like that.
fix $float in get()
syncing one more time
fix UTIL version of set()
3 bytes saved by _document->document. 
15 bytes by using classList with !ie9compatibility.
2 more bytes by reverting _true/_false
saving more bytes. Only 2 more bytes to go.
...and under 4k again