joyent/node — pull request #8310 by calvinmetcalf (2014-09-03 13:23:00+00:00)
Title: doc: document _transform callback takes 2 arguments

Expands the paragraph in the transform stream
implementation docs about the callback that is passed
to the _transform method to include details about how
two arguments may be passed, error and data. A code
example is also included.