Thinking out loud about set & bag construction

gistfile1.txt

set (1, 2, 3)       ==>  set(1, 2, 3)
set [1, 2, 3]       ==>  set([1, 2, 3])
my @a = 1, 2, 3;
set @a              ==>  set(1, 2, 3)
set { a=>1, b=>2 }  ==>  set({ a=>1, b=>2 })
my %h = a=>1, b=>2;
set %h              ==>  set(a=>1, b=>2)
{ a=>1, b=>2 }.Set  ==>  set(a, b)
%h.Set              ==>  set(a, b)
(a=>2).Set          ==>  set(a)
(a=>False).Set      ==>  set()
(a, b, c).Set       ==>  set(a, b, c)
a.Set               ==>  set(a)
@a.Set              ==>  set(1, 2, 3)

bag (1, 2, 3)       ==>  bag(1 => 1, 2 => 1, 3 => 1)
bag (1, 1, 1, 2)    ==>  bag(1 => 3, 2 => 1)
bag %h              ==>  bag( (a=>1)=>1, (b=>2)=>1 )
bag { a=>1, b=>2 }  ==>  bag({ a=>1, b=>2 } => 1)
{ a=>1, b=>2 }.Bag  ==>  bag("a" => 1, "b" => 2)
(a=>2).Bag          ==>  bag("a" => 2)
(a=>1, b=>2).Bag    ==>  bag("a" => 1, "b" => 2)
a.Bag               ==>  bag("a" => 1)

bag a=>1, b=>2      ==> 2 unexpected named parameters passed (a, b), perhaps you wanted .Bag ?