Var: batch set regression in 0.13

[deterdw]

The documentation example for var batch set no longer works (since the vars have different types).

Laminar 0.12.2 works: https://scastie.scala-lang.org/wTlXRDIxSPS0EugsZcMa1w
Laminar 0.13.0 doesn't work: https://scastie.scala-lang.org/IxxUzoreQwq7xK1wJI7OYg

[raquo]

Thanks for the report, I'm surprised our test suite didn't catch that, but it is a legit bug. Looks like our Scala 3 migration made the Var.set and similar method signatures incorrect. Scala 3 is annoyingly incapable when it comes to existential types, so I'm not sure how _exactly_ we'll fix that, but I did have a pretty comprehensive look at the options recently, so I'll pick the poison from what's available... As a temporary workaround, you can use asInstanceOf to lie to Airstream that your VarTuple[Boolean] is actually VarTuple[Int] (or the other way).

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--Nikita