babel-polyfill and es6-shim about es6-shim HOT 8 OPEN

This code works well with only babel-polyfill and es5 shim and sham. The problem occurs when adding es6-shim here.

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Is this still an issue after #466 is merged?

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Yes. This seems to be another problem. I'll track it down.

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shimtest.js: https://gist.github.com/gnh1201/2627d860e41f8bd2dba858536836c64e

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@gnh1201 why do you need both - core-js and es-shims? It's a bad practice. What does es-shims fix in this case? BTW babel-polyfill is obsolete for a long time ago and the actual version of core-js should be used directly.

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@zloirock I had no choice but to choose babel-polyfill and es5-shim. It worked well and successfully executed the JS library file written in ES5. Trying es6-shim was an option for me, but I thought I'd still test it.

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While most of the es-shims should work fine alongside core-js, it's definitely odd to mix them.

I would expect that es5-shim and es6-shim alone could get you mostly up to speed, except for the Symbol shams that core-js includes but es6-shim does not.

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I tested core-js and confirmed that the example code works well. But I still have to wait and see. I think I need to check the impact when es-shims is excluded from my project.

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