So it turns out that if you use private class fields, these objects are buggy when proxied.
See https://codepen.io/leaverou/pen/ExdWwax?editors=0012
That’s …very unfortunate. It means you cannot use these objects in #vue for example (Vue testcase: https://codepen.io/leaverou/pen/MWPpEQg?editors=1012 )
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Sad news for me. I really would love to be able to use them with Vue.
Private fields are a godsend for maintainability, but are real troublemakers in most languages for serializing, proxying, unit testing...
Sigh.
