[plt-scheme] Re: On PLaneT packages and compatible upgrades

For me, its clear that package users should  be able to use minor version to
specify exactly which package they want. It is almost impossible for a
package author to ensure that his upgrade will not brake any existing
clients.

If I have written and debugged a complex app using several 3rd party
packages the last thing I need is for one of the package authors to break my
perfectly fine application by releasing a new version that solves a bug for
which I already had a work around and on which my app was relying. I do not
care about the upgrade if my application is is already working.

Unfortunatly, the real contract between the package and the client is the
package implementation.

-pp
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