Commits on Mar 5, 2019

1. Normative: Make JSON.stringify(-0) preserve the sign …

   Although JSON supports -0 per ECMA-404 and JSON.parse('-0') returns -0, JSON.stringify(-0) currently loses the sign, outputting just '0'.
   
   This patch makes JSON.stringify(-0) return '-0' instead, so that the following holds:
   
       Object.is(JSON.parse('-0'), -0);
       // → true (this is already the case, even without this patch)
       JSON.stringify(-0);
       // → '-0'
       Object.is(JSON.parse(JSON.stringify(-0)), -0);
       // → true
   
   Results in current JavaScript engines:
   
       $ eshost -se 'Object.is(JSON.parse("-0"), -0)'
       #### Chakra, JavaScriptCore, SpiderMonkey, V8
       true
   
       #### XS
       false
   
       $ eshost -se 'JSON.stringify(-0)'
       #### Chakra, JavaScriptCore, SpiderMonkey, V8, XS
       0
   
       $ eshost -se 'Object.is(JSON.parse(JSON.stringify(-0)), -0)'
       #### Chakra
       true
   
       #### JavaScriptCore, SpiderMonkey, V8, XS
       false

   

   mathiasbynens committed Mar 5, 2019
   Copy the full SHA

   69be071 View commit details

   Browse the repository at this point in the history