In S02 it is writ, "The key type of a hash may be specified as a shape 
trait--see S09."

However, S09 is rather brief on hashes, and although it shows using a type 
inside the curlies, it never talks about shape traits or anything else.

Am I do understand that it pretty much does all the same stuff that Array does?

More globally, nothing is said much about parameters to types.  It shows an 
example like  Array[of=>T] but never discusses the syntax of defining 
parameterized types or anything.  Is there a paper or discussion on that I 
could read?


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