Not cloning the null elem - probably quicker to make it again
Caching values in 'for' by PK, not by value
[samples] Updating deps etc
Removing old workaround from README
[flow-sample] Updating to use no CLJS optimisations
[samples] Updating all the samples to use :none optims
Merge branch 'no-closure-optims' into 0.2.0-b5
Only replacing a node if it has changed
Sorting out the 'for' construct caching
Taking out an apply
If we get a value out of an atom twice, it's not the same object, because we call '->lens' on it, so they're never identical.
Merge branch 'perf-improvements' into 0.2.0-b5
Bumping to b5
Merge branch '0.2.0-b5' into 0.2.0-branch