JS2 Backend: Lifetime Borrowing

[ambiguousname]

For opaques: If we don't want to retain the selfEdge argument itself, we could this.#selfEdge.push(...selfEdge) (see example/ICU4XDataProvider for an example of this)

Need to do more testing for anything borrowed: slices, structs, opaques, etc.

[sffc]

Specific cases:

• https://github.com/rust-diplomat/diplomat/pull/487#discussion_r1651463232
• https://github.com/rust-diplomat/diplomat/pull/487#discussion_r1651467946
• https://github.com/rust-diplomat/diplomat/pull/487#discussion_r1669319755

[ambiguousname]

Overly conservative edge setup.

For instance, Foo.bar should have this.#aEdge instead of this for aEdges.

[ambiguousname]

We could either immediately destroy anything, or register a garbage collection hook

[ambiguousname]

Set anything that we pass into WASM to something that wasm can't parse when it is destroyed.

[ambiguousname]

Possible values: Symbol() or bigints

[ambiguousname]

When returning a reference to an opaque, skip the step where you register the opaque with the FinalizationRegistry

[Manishearth]

(and make sure selfEdge is appropriately populated when a method does this)