If this someone has parsed this JSON with their own hand-rolled parser in Ruby, then that parser is accepting invalid JSON and should be dumped in favor of one used by other Ruby projects. If this is being parsed by a popular Ruby library, alert the maintainers of that code to the JSON spec (or the RFC) epecially this part:

      array = begin-array [ value *( value-separator value ) ] end-arr
+ay
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Notice that it isn't array = begin-array [ *( value value-separator ) ] end array