add test for 7909e3de17f6 (r"\u2200")
widen the sigatomic blocks around uv_write
deprecate logb to exponent. closes #2516
remove ::IO in 1-arg countlines where it did not belong
remove a few more ::IO in datafmt.jl
rename ref to getindex, assign to setindex!
closes #1484, closes #907
there are aliases in deprecated.jl to ease the transition
add filename to include_string. fixes #2483
doc rename ref and assign
Merge pull request #2533 from wlbksy/docrename

doc rename ref and assign