lihaoyi/upickle — pull request #43 by ramnivas (2014-11-18 05:00:35+00:00)
Title: Allow custom writers to specify ignoring a value

+ Fixes #40
+ Introduces Js.None, since Js.Null has semantics of Javascript null.
This allows custom writers to return Js.None to specify that the
value should be writen to the output.