Fixes https://github.com/hapijs/topo/issues/23

[ghost]

No description provided.

[Marsup]

You should put a test on that unless you're open to regressions.

[devinivy]

This looks pretty good– I'd like to make sure there aren't other similar issues. It might make sense to instead use Object.create(null) to get an object with an empty prototype, rather than performing hasOwnProperty() checks through the code. Unless you've already done the work @vam, I'm happy to provide the regression test.

[devinivy]

Turns out there were some more issues around using groups named after properties of Object.prototype. I'm replacing this PR with #25, which also contains a regression test. @vam if you have a moment, let me know if it resolves your original issue.

[ghost]

@devinivy +1 on the solution with Object.create(null). Yes that solved my problem. Thanks!

[lock]

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