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2009 Apr 26
2
Some extensions to class inheritance and method selection
Changes were committed today to the r-devel version of R to make S4 and S3 classes (and abnormal object types such as "environment") work together more consistently. Basically, S4 classes can now contain any S3 class or object type, and should now inherit S3 methods for these. Also, the main practical problem with defining S3 methods for other S4 classes (namely, that S4