See the change for "changed" in json4s

[mccartney]

Current output of json4s' matchJson in case of changes shows just one side of the diff (i.e. expected), e.g.

    "Changed:
    {"sources": "two"}"

It would be useful if it shown both sides. I.e. both expected and actual. Something like:

    "Changed, actual:
    {"sources": "one"}

   expected:
    {"sources": "two"}"
    "