Tuples a first class feature, manu's new unary operator and named arguments

[Walter Bright]

On 5/8/2020 9:36 PM, Manu wrote:
> It's still hideous though. Fundamental language features would ideally be 
> acknowledged and speced rather than expressed incidentally by an ugly hack.

We can defer this discussion until the DIP is presented. But the existence of 
the AliasSeq should be discussed in the DIP as an alternative.