[racket] internal represent of array are incompatible between library json and bson (mongodb.plt)

Hi,

  In the library json, array is represented as list. But in the
mongodb.plt, array is represented as vector. The bson is almost the same as
json in concepts. If we can make json compatible, it's easy to translate
json to bson and vice versa.

  I would like to submit patch that makes both list and vector works in the
json library and mongodb.plt.

Regards,
Haiwei
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