Allow service methods to omit return value #179
Currently service methods can't have void/unit/null return type. Forcing every method to return something may sensible when we didn't have errors (#38), but no more now. In certain scenarios, no news is good news and we can raise an error when something goes wrong.
A syntax I would suggest is to simply omit method's return type:
One more thing to consider is whether to force methods lacking return value to have error.
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