Yes, it is not a direct dependency, Caddy requires 1. golang-github-google-cel-go-dev, which requires 2. golang-github-google-cel-spec-dev, which requires 3. golang-goprotobuf-dev (>= 1.4.3~)
i believe with with golang-github-golang-protobuf-1-5 superseeding golang-goprotobuf-dev (>= 1.4.3~) that was stuck in experimental, migrating caddy into unstable should be rather straightforward from here on :)
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