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A general description is here.
The ‘Rcomplex’ definition (in header ‘R_ext/Complex.h’) has been extended to prevent possible mis-compilation when interfacing with Fortran (PR#18430). The new definition causes compiler warnings with static initializers such as ‘{1, 2}’, which can be changed to ‘{.r=1, .i=2}’.
Using the new definition from C++ depends on compiler extensions supporting C features that have not been incorporated into the C++ standards but are available in ‘g++’ and ‘clang++’: this may result in C++ compiler warnings.
‘bs()’ and ‘ns()’ in the (typical) case of automatic knot construction, when some of the supposedly inner knots coincide with boundary knots, now moves them inside (with a warning), building on PR#18442 by Ben Bolker.