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What happened to VarIsValidRef?

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In the REST code example I have, it looks like the demo has not been updated to work with version

  var dt := TDateAndTime(JSON.Parse(http.ResponseText));

  // dt.date will be 'undefined' if a bad response is returned
  // this may cause problems in a more complex code but works fine here
  Log('Date: ' + dt.date);

  // better way is to test explicitely
  Log('Time: ' + if VarIsValidRef(dt.time) then dt.time else 'unknown');

Has this function been removed? If so, what is a method to replace this. I saw some commented examples in SmartCL.Graphics.pas, but I was not sure how to handle this.

Thanks for any feedback.

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