Bug: @as doesn't work for props with jsx V3

[DZakh]

https://rescript-lang.org/try?version=v10.1.2&code=ALBWGcA8GEHsDsBmBLA5gCgN4DcCmAncZBALgAIBmAXwEoAoOgW1gBMBXAG1zIEklYAguDIBeMpjpkywZuy7oARMADGAQ3wdVAekQdY+VQprT8uVcoAuAOmWxGABwS54FyWVyQLBeKo5lGqgDWuOTowKrgihYAnva4RmQAfjFxAPrk4Bb4yPCoxiIAfGQASmaWVrhcjM4WomQKfIiwCnRUTKyc3I2wALKquVwsdRJSMh3ySmoa2rr6hsbApubWtg5OLm4eXvg+fgHBoYmpKSFkmdm5+UWlyxVVNXUN-C1tdFy1lXUAPN19A7hDY6xXAiBRNZpkLQFN64D4cABM326QjIJ1SoPBCkh0KAA

Related to:
#5908

And after the #6354 is released, it might become a bigger problem.

Now, we need to migrate to JSX V4 before we can start using ReScript V11 🥲 It was needed anyways, but I wanted to do it in a different order.

[DZakh]

It actually doesn't work for any external bindings.
https://rescript-lang.org/try?version=v10.1.2&code=C4TwDgpgBMBQsAEA2BLAbtBB7ARgK1ggA9gIAnAOwEMkoBbKgawgH0AzLLAdQAtyIAkhTABXYAC4oACgB+LKhQAmklBWABeAPwBKKOoB8MPVABEJ+EgjAoVYw2btOvfkNHBZ8peoCMAJgDM2vDI6Ji4BMSklDT0TKwc3HxkgsJivpJSCFQAzlImCoomunKeylCqGjp6htbqpuawltY4dnGOiS6pwL4epT4BQUA

[DZakh]

@zth I've encountered another issue caused by the removed key mangling in rescript-relay that disallowed fields that stopped working. And since @as doesn't work with external, there's no workaround (without the need of breaking changes).
So, I think we either should revert key mangling for now, which I really don't want to do. Or add @as support for external and update the affected libs.

[zth]

@DZakh maybe better to open a dedicated issue for this on the RescriptRelay tracker. V3 removes object makers anyway.

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