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According to RFC 4627, only the following Unicode code points are allowed unescaped in JSON: unescaped = %x20-21 / %x23-5B / %x5D-10FFFF However, ActiveSupport::JSON did not escape the range %x00-1f. This caused parse errors when trying to decode the resulting output. [#3345 state:committed] Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>