rvagg/node-leveldown — pull request #74 by Kyotoweb (2013-11-14 05:47:47+00:00)
Title: Compression should be enabled by default (ref. doc).

In the doc. it says compression is enabled by default. Tho' if you call .open(callback), optionsObj is not set and NanBooleanOptionValue will return its default fallback, which is not specified here, so equal to false.