I think this motivation can be summarized as: #prepend has use cases, in
particular for singleton classes.
I don't see this in AS. AS is defined as a fine balance:
* Ruby extensions key for Rails core development.
* Ruby extensions experience proves to be really really
helpful/common in web development.
Add to that a few rule exceptions due to historical reasons, and you get AS.
In that sense AS has a different goal than facets, say.
In this particular case, I don't see preextend fits into that definition,
and as you saw this is nothing but prepending in the singleton class.
I would use plain Ruby until the Ruby language defines something like this
itself.
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