Turns out Chef+Aruba (0.3.5 or later) can be problematic too, but
there seems to be a way to sidestep this by exploiting a bug in
Bundler (1.0.11).
Of course when everything falls apart because you have the wrong json
gem, then you never saw this - right?
HTDH 
--
πόλλ' οἶδ ἀλώπηξ, ἀλλ' ἐχῖνος ἓν μέγα
[The fox knows many things, but the hedgehog knows one big thing.]
Archilochus, Greek poet (c. 680 BC – c. 645 BC)
http://wiki.hedgehogshiatus.com