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A general description is here.
‘file.path()’ has some support for file paths not in the session encoding, e.g. with UTF-8 inputs in a non-UTF-8 locale the output is marked as UTF-8.
Most functions with file-path inputs will give an explicit error if a file-path input in a marked encoding cannot be translated (to the native encoding or in some cases on Windows to UTF-8), rather than translate using escapes as previously.
A C++ compiler default is set only if the C++11 standard is supported:
it no longer falls back to C++98.