The partial() function fails on ranger objects unless the data= argument is explicitly named in the call. get_training_data.default() could use match.call() to figure out the names when they are not specified. Also, it calls eval() without an environment argument. The calling environment should be passed down the stack so that the evaluation happens in the right frame, although even that is not fool-proof. Why is there a check for S4 objects? There could be a getCall() method for an S4 class just as easily as for an S3 class.
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