Release 5.1
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Something got rattled with the S3 interface in R 4.x. It no longer works the way it did in release 3.x. Therefore, I took the S3 interface out because I want the package to work with both 3.x and 4.x installations. Furthermore, the advantages of the S3 interface are incremental at best and I don't feel like debugging R internals.
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Implemented a 'summary' function for map objects.