WIP: Passable collections

[erights]

Fixes #16

Working my way up to passable sets and maps indexed by sameStructure equivalence. This will let us express our setMathHelpers naturally and efficiently. Not there yet.

The draft proposed changes to our store apis, and the new trieStore, are here and interesting. The diverge/snapshot/readOnly methods are based on https://github.com/tc39/proposal-readonly-collections

NOT URGENT. Just a curiosity until we're past Zoe alpha.

[erights]

Read in order:

• weakStore.js
• store.js
• trieStore.js

[FUDCo]

Don't know that it's worth blocking you from merging, but I think you should fix the allocation thing in finalStore (unless I'm actually misunderstanding what's going on, which is certainly possible).

[erights]

Don't know that it's worth blocking you from merging, but I think you should fix the allocation thing in finalStore (unless I'm actually misunderstanding what's going on, which is certainly possible).

Fixed. If this was a "conversation" I'd say "Resolve conversation".

[michaelfig]

This is a ping from your friendly neighbourhood housekeeper.

Is this PR still relevant? If so, but you're not prepared to act on it, could we temporarily close it and make an issue that points to it?

[erights]

@michaelfig
I'm going to keep this one open in the icebox as it has an interesting start on some relevant collection technology. But if I use it, it'll probably start new PRs and just keep this one for reference.

[erights]

Closing in favor of #3531