Inconsistent hash indentation in ruby-mode

Question

I've noticed that indent-region behaves this way in ruby-mode:

  {
    down_payment: 40.00,
    payment_day: 10
  }


  {
    "down_payment": 40.00,
   "payment_day": 10
  }

Both are valid Ruby hashes, so in principle they should behave the same way. My config for Ruby is:

(set-indent 2)
(setq ruby-deep-indent-paren nil)

Is there some configuration variable that I missed or misconfigured?