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A general description is here.
‘summary.default()’ no longer rounds, but its print method does, resulting in much less extraneous rounding notably of numbers in the ten thousands.
(In progress.) ‘configure’ looks for a flag for the C++ compiler which
approximates C++98/C++03 compliance, and uses it as part of the ‘CXX98’
macro in file ‘etc/Makeconf’. For example, ‘-std=gnu++98’ is selected
for ‘g++’ 6.x.
‘format(<AsIs>)’ looks more regular, also for non-character atomic matrices.