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Are there other JS interfaces that use the global symbol pattern? ie [Symbol.dispose] or is this some new approach?

I get it but haven't really seen that sort of thing before.

You can find a more complete list of "well-known symbols" here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...

Thank you!

Yeah, there's a number of cases that use the Symbol pattern. They're all relatively new, but that's at least in part due to Symbols themselves being relatively new.

Symbol.iterator comes to mind as a decent example.

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