Description:

Polymorphic return values are really useful. Often, we just want to
know if something worked or not. Other times, we'd like to know what
the error text was. Still others, we may want to know what the error
code was, and what the error properties were. We don't want to handle
objects or data structures for every single return value, but we do
want to check error conditions in our code because that's what good
programmers do.

When functions are successful they may return true, or perhaps some
useful data. In the quest to provide consistent return values, this
gets confusing between complex, informational errors and successful
return values.

This module provides these features with a simple API that should get
you what you're looking for in each context a return value is used in.