As aluded to in Brian Marick's recent thread, there is an 'as' keyword 
which can be used to pattern match on a union type in within a function 
arguments, like this:

animation ((DropsPerSecond raw) as dropsPerSecond) = …

No mention of it in the syntax guide: 
http://elm-lang.org/docs/syntax#union-types or the elm language 
FAQ: http://faq.elm-community.org/

Is it safe to use it in the sense that it is an official part of the 
language and is not something that is not documented as it may go away in 
the future?

... I am begining to think it would be worth compiling a list of missing 
documentation and trying to organize an effort to contribute the missing 
information as pull request.

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