Suggestion, add attribute to items json indicating whether the item is currently available in live or not.

[chasimm3]

It would be helpful to be able to determine which items are currently available in live or not. For example, diffusal 2 is in the item list but hasn't been in the game since 7.07. The data for older items is also stored in different attributes, so flattening the structure for data analysis becomes difficult when including deprecated items.

[howardchung]

We could probably stick an additional property in the data in the update script: https://github.com/odota/dotaconstants/blob/master/tasks/updateconstants.js#L334

Note: we currently only do this for iron talon and diffusal blade 2.