** Summary changed:

- incorrect JSON serialization of supplementory plane code points
+ Incorrect JSON serialization of supplementory plane code points

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https://bugs.launchpad.net/bugs/1025622

Title:
  Incorrect JSON serialization of supplementory plane code points

Status in Zorba - The XQuery Processor:
  In Progress

Bug description:
  this bug is a follow-up of bug #1024448

  Currently, the result of the following JSONiq query:

    let $message := "👊"
    return { "message": $message }

  is serialized into incorrect JSON:

    { "message" : "\ufffffff0\uffffff9f\uffffff91\uffffff8a" }

  the correct result would be:

    { "message" : "\ud83d\udc4a" }

  Explanation:

  Characters from the supplementory plane are usually represented in
  utf-16 surrogate pairs within JSON results. The above result is in
  particular incorrect because JSON allows only 4 hex digits after '\u'.
  utf-16 surrogate pairs alway fit into a 4 hex digit or 2 x 4 hex digit
  window which is most probably the reason why utf-16 is used.

  This has been greatly fixed in the JSON parser by Paul (see mp:
  https://code.launchpad.net/~paul-lucas/zorba/bug-1024448/+merge/115248
  ), but it still needs to be fixed in the serializer.

  @Paul: I'm not sure if you are the right person to assign this bug to?

  thanks

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