[R-package] preserve uses of '...' in Dataset slice() method #4581
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As mentioned in #4573 (comment), the changes in #4573 (removing
...
fromDataset$new()
) represent a small regression, since they break the currently-supported behavior of passing additional parameters or attributes likeweight
throughDataset$slice()
.This PR restores that behavior, makes the deprecation warning about
...
clearer, and adds unit tests to confirm that that behavior still works.Note for Reviewers
When the breaking changes in #4226 are implemented in release 4.0.0, the unit tests introduced in this PR will break and should be removed.