bug#12721: 24.2; package-installed-p behavior on emacs startup

[Richard Stallman]

    >     `featurep' typically indicates if a particular file has been loaded,
    >     whereas `package-installed-p' indicates whether the package is 
available
    >     (e.g. can be loaded).
    > Should it be `package-available-p'?

    It's probably not worse, but I don't see why it would be better.

I guess it depends how clear the current name is.
It wasn't clear to me that "installed" means "installed in your system",
but maybe most people will understand it.

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Dr Richard Stallman
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