Strange Array#each Ruby behaviour?

This kind of behavior often happens when you change a collection while iterating over it. So if usr. Enter modifies user.room.

User that would explain the behavior you're seeing.

As @sepp2k said, presumably usr. Enter is modifying user.room.users. Though I've never looked at the source, Array#each seems to work by maintaining an internal index for the current element, and incrementing that index after each iteration (indeed, that's the only reasonable way it could work).

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