Backport 9815 & 10161 to v6.x#11176

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thefourtheye wants to merge 2 commits intonodejs:v6.x-stagingfrom

thefourtheye:backport-9815-v6.x

Commits on Feb 5, 2017

buffer: convert offset & length to int properly
thefourtheye
committed
test: move long-running test to sequential

Trott
authored and
thefourtheye
committed