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Maybe `zip` two, then `zip` the result with the third and the result with the fourth?
The resuld of the first two `zip`s could be a pair and triple, or POJO for example.

The trickiest part here were nested ifs, but I’ve managed it. :slightly_smiling_face:
```untilBuild.convention(
    extension.sameSinceUntilBuild
        .flatMap { sameSinceUntilBuild -&gt;
            untilBuild.map { "$it.*" }
                .takeIf { sameSinceUntilBuild }
                ?: buildNumberProvider.map { "${IdeVersion.createIdeVersion(it).baselineVersion}.*" }
        }
        .zip(extension.updateSinceUntilBuild) { untilBuild, updateSinceUntilBuild -&gt;
            untilBuild.takeIf { updateSinceUntilBuild }
        }
)```

I’ve used <https://github.com/wernerdegroot/applicatives> recently to code-gen a multi-zip