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A general description is here.
Many more basic operations are now interruptible when run on size-able
vectors: typically interrupts are checked for every 1-100 million
elements.
‘backsolve(T, b)’ gave incorrect results when ‘nrows(b) > ncols(T)’ and ‘b’ had more than one column.
It could segfault or give nonsense if ‘k’ was specified as more than ‘ncols(T)’.