[gurkendoktor]

I think the point is that Array(h) destroys the Hash, whereas [h].flatten will leave it intact, adding another unexpected gotcha to Array().

Array's terrible friend Integer() implicitly crashed my app in production before, so found that interesting to know; not necessarily related to your talk though. :)

[vidarh]

[h].flatten on the other hand of course breaks horribly when someone decides that one of the values is meant to hold an array.