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[amindfv at gmail.com]

My point is that there's a cost to adding instances -- namely that accidental calling of the class functions (e.g. after refactoring) isn't caught by the compiler.

Since there's a cost, we need to make sure there's a larger benefit before we add them -- e.g. a hypothetical or real use-case.

Tom


> El 9 mar 2016, a las 20:28, Fumiaki Kinoshita <fumiexcel at gmail.com> escribió:
> 
> Thinking an instance non-practical does not imply we *never* use the instance. The lack of a uniquely legal instance turns out to be a problem at some point, maybe right now.