• Don't use polyfilled symbols as internal uids, a workaround for some incorrect use cases
• String#replaceAll is available only in nightly FF builds
• Improved Promise feature detection for the case of V8 6.6 with multiple core-js copies
• Some internals optimizations
• Added Node 13.2 -> V8 7.9 compat data mapping
• Returned usage of node -e in postinstall scripts