[R-package] remove uses of ... in Predictor constructor #4338
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Contributes to #4226
This PR proposes removing the use of
...
from the constructor for thePredictor
class in the R package. That class is not exported in the package's namespace, so this is not a user-facing breaking change.Removing this use of
...
makes the package's code slightly stricter, which reduces the risk of bugs.