Difference between classic_hidden and extended_extended

[chathuriw]

HI,

For each modes (Compatibility, Compatibility + extended, Extended), you have three variations. Could you please explain the difference between classic_hidden and extended versions. For example what is the difference between https://github.com/twitterdev/tweet-updates/blob/master/samples/extended_classic_hidden_13761.json and https://github.com/twitterdev/tweet-updates/blob/master/samples/extended_extended_14001.json.

Thanks you !!!