> Unary C<~> now imposes a string (C<Str>) context on its
>  argument, and C<+> imposes a numeric (C<Num>) context (as opposed to
>  being a no-op in Perl 5).

Shouldn't unary minus be mentioned too? 
Or would one need C<0-> or C<-+>? 

>  A reduction operator really is a list operator, and is invoked as
>  one. Hence, you maybe implement a reduction operator in one of two
>  ways.

s/maybe/may|can/ ?

>  By default, if there is one argument, the built-in reduce operators
>  return that one argument.  However, this default doesn't make sense


Groet, Ruud

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