I've seen several roll-your-own solutions to this, but I have yet to see one that supports "copy" and "move". And rarely do I see one that supports "test". I li

I've seen several roll-your-own solutions to this, but I have yet to see one that supports "copy" and "move". And rarely do I see one that supports "test". I like those features, even if I think the "op"syntax is clumsy as anything and add/update/remove can just be a JSON object be key:value/new_value/undefined