Golang AMF v3

as per https://en.wikipedia.org/wiki/Action_Message_Format

works encoding and decoding for all the primitives as well as for dynamic Objects, eg:

{
    abc: "abc"
    ,dtl: new Date
    ,num: Number(123.456789)
    ,arr: [0,1,2,"lol",3]
    ,int: 1337
}

I use this for binary websockets.