Crashes with some polyfills: @@toStringTag is not writable.

[amangeot]

Hello, I receive this error in console on Android Kitkat webviews:

Uncaught TypeError: Cannot assign to read only property '@@toStringTag' of [object Object]", source: http://192.168.1.23:5050/vendor.19.js

Troubles arise from this line: Gp[toStringTagSymbol] = "Generator"; because toStringTagSymbol is not writable.

Some polyfills made it writable https://github.com/Financial-Times/polyfill-service/pull/1295 to make sure it works with regenerator.

So I wrote about the issue here: https://github.com/medikoo/es6-symbol/issues/24, but apparently the spec wants @@toStringTag to not be writable. EDIT: I thought it was related to this polyfill I use

Is it possible to not overwrite @@toStringTag ?