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R CMD INSTALL now behaves the same way with or without --no-multiarch on platforms with only one installed architecture. (It used to clean the src directory without --no-multiarch.)
rbeta(n, a,b) no longer occasionally returns NaN for a >> 1 > b. (PR#14291)
theThe S4 initialize() methods for "matrix", "array", and "ts" have been fixed to call validObject(). (PR#14284)