Managing metadata about attribute types

[Thien Vuong]

KUSUNOSE Toru wrote:

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> Sometimes, the latter is better.
>

Definitely. I could see much good use of it.
Just only wanted to point out that it is not always one way or another.

> For example, think Tempfile class. An instance of Tempfile
> class responds to every methods an instace of the File class has,
> so surely its type is File. But tmpfile.is_a? File is false.
>

Thanks for pointing it out. I wonder if I have some code needs to check
if it has a file behaviour or not (say the stream behavior plus about
10 differrent methods), how could I do it concisely? I could structure
the application such that it is not necessary, but it is not always
possible nor desirable to do so.

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