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XS: JSON.stringify incorrectly considers object cyclic #60

Description

@tevador

Sample code:

let x = {};
x.a = x;

try {
  JSON.stringify(x);
} catch(e) {}

delete x.a;

print('Number of keys: ' + Object.keys(x).length);

JSON.stringify(x); //throws here

It seems like the engine 'remembers' that an object had a circular reference and subsequent calls to JSON.stringify fail even if the object is not circular anymore.

Steps to reproduce:

  1. Save the above sample code to file "circular.js".
  2. Run ./xst -s circular.js
  3. Observe output:
Number of keys: 0
TypeError: JSON.stringify: cyclic value

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