Convert anArray to an instance of the receiver. anArray is
structured such that the instance can be conveniently and fully
specified using brace-syntax, possibly by imposing some
additional structure on anArray.
join: aCollection
Answer a collection formed by treating each element in
aCollection as a `withAll:' argument collection to be added to a
new instance.
with: anObject
Answer a collection whose only element is anObject
with: firstObject with: secondObject
Answer a collection whose only elements are the parameters in the order
they were passed