Map: Same value zero failing.

paulmillr / es6-shim

ECMAScript 6 compatibility shims for legacy JS engines

http://paulmillr.com

MIT License

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Map: Same value zero failing. #378

Closed Xotic750 closed 8 years ago

Xotic750 commented 8 years ago

Here are the tests that show up the SameValueZero issue. All of the tests are required for it to happen, if you strip out what you may think are not necessary then you will get a pass, just like with your original tests. So, it is something to do with the particular order of happenings.

https://travis-ci.org/paulmillr/es6-shim/builds/93772657

My guess is that it is an JS engine bug as Node v0.10 passes, which is using the es6-shim shim. But it could be a bug in a patch.

ljharb commented 8 years ago

This is definitely a weird v8 engine bug. Not all of the lines are required, but it seems to happen specifically when the Map's size is 4 before the -0 is set.

ljharb commented 8 years ago

Thanks for the report!