characters \u2000 through \u20FF are being escaped, but they are not control characters about json-simple HOT 3 OPEN

It's not incorrect to escape a character even is not necessary according to 
JSON spec. The purpose is to eliminate some issues in a certain circumstance. 
But I agree to review it. May I ask what trouble it causes by escaping these 
characters?  

If you escape a character in the payload (content of any variable) you are 
changing the content.

Changing a text from "foo - bar" to "foo \u2013 bar" does not seem a good 
solution.

Characters between \u2000 and \u206F are general punctuation symbols.

I can't see any reason for not fixing this. 

For what its worth,  I suffer from the same problem. 

When the Josn decides to escape the charterer it lengthens the string.
And in Push Notification, you are limited by the size of Payload (256 byte 
total) which isn't much. 

So characters in this range \u2000 - \u206F are represent with 6 bytes and not 
2.