Subclause [diff.library] summarizes the explicit changes in headers,
definitions, declarations, or behavior between the C standard library
in the C standard and the parts of the C++ standard library that were
included from the C standard library.
declares the names nullptr_t, byte, and to_integer,
and the operators and operator templates in ([support.types.byteops]),
in addition to the names declared in
<stddef.h> in the C standard library.