Affected subclause: [string.conversions]
 Change: Output of floating-point overloads of 
to_string and 
to_wstring.   Rationale: Prevent loss of information and improve consistency with other formatting
facilities
.   Effect on original feature: to_string and 
to_wstring function calls that take
floating-point arguments may produce a different output
.  For example:
auto s = std::to_string(1e-7);