This sounds like a use case for Symbol.for https://tc39.github.io/ecma262/#sec-symbol.for <https://tc39.github.io/ecma262/#sec-symbol.for> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.mozilla.org/pipermail/es-discuss/attachments/20171113/7a45df2e/attachment.html>