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A general description is here.
If a reference class has a validity method, ‘validObject’ will be called automatically from the default initialization method for reference classes.
Improved performance and robustness of matrix multiplication using BLAS: DGEMV is now used instead of DGEMM for matrix/vector and vector/matrix multiplication, ZGEMM/DGEMM/DGEMV is bypassed when the input has NaN or Inf values, and performance for these input checks has been improved.
‘str()’ no longer shows ‘"list output truncated"’, in cases that list was not shown at all. Thanks to Neal Fultz (PR#17219)
If a reference class has a validity method, ‘validObject’ will be
called automatically from the default initialization method for
reference classes.