Ensuring unique sign IDs

:help :sign-place says:

It's up to the user to make sure the {id} is used only once in
each file (if it's used several times unplacing will also have
to be done several times and making changes may not work as
expected).

While it is easy enough to ensure that any one given plugin does not
re-use signs, what is a good way to ensure that multiple plugins don't use
overlapping signs?

I can check the redirected output of :sign place buffer={buffer number}
before I place any signs, but I'd guess not all plugin authors do this, so
they could clobber my signs fairly easily.

Is this the recommended approach or is the problem mostly ignored?

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