Add a checkbox to Goodreads' book series pages that allows you to hide books that aren't part of the core series/primary works (#0.1, #3.5, etc).
< Rückmeldungen auf Goodreads, show only the "primary works" in a series on series pages
I think in most cases books labeled #0 are full-blown stand-alone novels. My main reason for making the script was to hide short stories, novellas, compilations, omnibuses, etc.
Working for me on Chrome with TamperMonkey. It doesn't hide book #0—don't know if the author purposely coded it to only exclude books with decimals and hyphens or whether this was overlooked because the test cases didn't have #0. For reference, see Diana Gabaldon's Outlander series.