On Oct 26, 8:12 pm, samppi <rbysam...@gmail.com> wrote:
> According to the docs, the function passed into an add-watch call
> receives four arguments. Its first argument is a "key". This key seems
> to be the same key as the key passed into the add-watch call, and so
> would always be the same, for the same ref and function. What is the
> point of this argument then? When would it vary?

The last part of add-watch's documentation explains it (when you want
to remove the watcher again, you need the key to identify it).
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