dillon1000/react

[Flight] Encode Symbols as special rows that can be referenced by models … (#20171)

* Encode Symbols as special rows that can be referenced by models

If a symbol was extracted from Symbol.for(...) then we can reliably
recreate the same symbol on the client.

S123:"react.suspense"
M456:{mySymbol: '$123'}

This doesn't suffer from the XSS problem because you have to write actual
code to create one of these symbols. That problem is only a problem because
values pass through common other usages of JSON which are not secure.

Since React encodes its built-ins as symbols, we can now use them as long
as its props are serializable. Like Suspense.

* Refactor resolution to avoid memo hack

Going through createElement isn't quite equivalent for ref and key in props.

* Reuse symbol ids that have already been written earlier in the stream