Change API to `setdefault` and `DefaultMap`

tc39 / proposal-upsert

ECMAScript Proposal, specs, and reference implementation for Map.prototype.upsert

https://tc39.es/proposal-upsert/

MIT License

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Closed dminor closed 3 months ago

dminor commented 3 months ago

Oops, I intended to open this against my own fork to get feedback prior to opening a PR here.