v8/test/mjsunit/regress/regress-2570.js

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var o = ["\u56e7",   // Switch JSON stringifier to two-byte mode.
         "\u00e6"];  // Latin-1 character.

assertEquals('["\u56e7","\u00e6"]', JSON.stringify(o));
assertEquals('["\u56e7","\u00e6"]', JSON.stringify(o, null, 0));