Breaking change in v3.3.0: Node < 8 is not supported anymore by core-js-compat

[nicolo-ribaudo]

Hi 👋

57f497d introduced the engines.node option in core-js-compat's package.json.
That package already works in node 6, since it uses only these "new" es features, which are supported in node 6

• for...of
• ... spread in function calls
• Map/Set (iterator closing is not supported)

While that metadata-only change might seem innocuous, it causes yarn to fail when installing it:

error core-js-compat@3.3.1: The engine "node" is incompatible with this module. Expected version ">=8.0.0". Got "6.17.1"
error Found incompatible module.

Would it possible to revert that change and:

1. Set in engines a node version which wasn't supported for real (e.g. >= 6.4.0, according to https://node.green/)
2. Increase it to 8.0.0 (or higher) in core-js 4
   ?

[zloirock]

Previous versions of this package were not compatible with Node 8-, moreover, with Node 8.3-, since here was used object spread syntax. Node 6 was available to work only in some cases like loading JSON data. Ok, I'll remove this field.

[nicolo-ribaudo]

Thanks!