v1.9.0 creates invalid json by including undefined values #57
Description
There seems to be a regression in v1.9.0 where objects with undefined values are being included in the json output, which is invalid. For example:
serialize({
"foobar": undefined
});Output:
{"foobar":undefined}This is not valid json, and will fail when run through JSON.parse()
In v1.8.0 this worked correctly with the following output:
{}