Fix strong mode warnings and add type-conversion static functions.
Add typed wrapper functions to delegate classes. These mirror the methods in the the collection package, and serve a similar purpose of safely casting generic objects when the user is confident that the actual object's values are more specific than the static type. R=floitsch@google.com, lrn@google.com Review URL: https://codereview.chromium.org//1870543004 .
Contains utility classes in the style of dart:async to work with asynchronous computations.
The StreamZip class can combine several streams of events into a single stream of tuples of events.
The package introduces a Result class that can hold either a value or an error. It allows capturing an asynchronous computation which can give either a value or an error, into an asynchronous computation that always gives a Result value, where errors can be treated as data. It also allows releasing the Result back into an asynchronous computation.