Lambdas and "typedefs" in Vim9

I have not followed the development of Vim9 script closely, but
yesterday I have started to play with it. I was pleasantly surprised to
see how far it's got already: I could convert some scripts of mine
without much effort and make them run just fine!

I have two questions/curiosities:

1. I was not able to pass lambdas to defs, only funcrefs. Can/will this
be supported?

2. Has a type aliasing or "typedef" mechanism been considered or,
perhaps, already planned? My use case is defining a library of opaque
types, which I can change without the need to modify client code.

Thanks,
Life.

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