I would like to suggest again to use Maybe over Union("failed", ...):
1. It has better abstraction. With "Union", you stuck with
hardcoded "failed" tag, it should be hidden under abstraction.
2. Better performance. As previous discussion showed.
3. There is a problem for "Union", there is this common idiom:
a := xxxIfCan(xxx)
a case "failed" => xxx
a::A_VERY_LONG_TYPE
With Maybe, there's no need to specify this long type, we can abstract
it into a function.
And I nolonger insist to add Monad together with Maybe,
Monad can be added later. For now, Maybe can be a simple
encapsulation over Union("failed", ...), with specialization for
commonly used types.
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