= Stream Type =

Abstract backEnd (platform) independant Type for support of a walkable collection (IEnumerable/Iterable).

{{{
#!python
class Example

    def main is shared
       pass

    def bill(customers as Customer*)
        for c in customers
            c.billIfNeeded

    def foo(ints as int*)
        t = for i in ints where i > 0
        print t

    def bar(ints as int*)
        t = List<of int>(t)
        t.sort
        t.reverse
        print t
}}}
 * The general form of a stream type is "foo*" where "foo" is the element type.
 * The "*" suffix can be thought of as "zero or more".
 * The type "foo*" can be read as "foo stream".
 * Streams can be applied to both primitive and complex types such as "int*" and "Shape*".
 * Streams are portable between backends, whereas .NET's IEnumerable<of> and JVM's Iterable<of> are not.
 * Streams are two-way compatible with IEnumerable/Iterable:
   * Streams can be used whereever a compatible IEnumerable/Iterable is expected.
   * An IEnumerable/Iterable can be used whereever a compatible stream type is expected.
   * The term "compatible" means the same inner type: int* is compatible with IEnumerable<of int>/Iterable<of int>, but not IEnumerable<of String>/Iterable<of String>
   * However, compatibility does not mean that you can use the methods of IEnumerable or Iterable, since these vary between platforms.
 * Streams are an abstract type, so you cannot create them directly with a call on the type such as `int*()`. Instead, use a concrete class such as `List<of>` or `yield` results out of a method.
 * Streams are defaulted to be empty rather than nil, so you don't have to guard their usage with an "if" statement. You can loop through them immediately.
 * Portability and readability are the main motivations for having streams in the Cobra language.
 * See also: [http://cobra-language.com/forums/viewtopic.php?f=4&t=216 "Streams" discussion], TypesOverview