Using (require (for-label (planet clements/rsound))) in my documentation just bit me in the butt really hard, when it turns out that installing a not-most-recent version of my planet package automatically triggers installation of the most-recent version, causing much pain for my students. AAH! Fortunately, Carl's (this-package-in ...) form should prevent this in future. If only I'd listened sooner...
Thanks! John
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