unorm literal implementation now ensures that the value is a proper unorm value (i.e. a value between 0.0 and 1.0, inclusive, which is equal to one of 256 discrete, equidistant values along that spectrum where the first value is 0.0 and the two hundred fifty sixth value is 1.0).

Author: mikebmcl

N3888_RefImpl/src/drawing.h

@@ -383,7 +383,9 @@ namespace std {
 					}
 
 					inline double operator "" _unorm(long double value) {
-						return ::std::max(0.0, ::std::min(1.0, static_cast<double>(value)));
+						auto result = ::std::max(0.0, ::std::min(1.0, static_cast<double>(value)));
+						result = ::std::nearbyint(result * 255.0); // We need to ensure it is one of the discrete values between 0 and 255.
+						return result / 255.0;
 					}
 				}
 #endif

N3888_RefImpl/src/xdrawing.h

@@ -15,5 +15,6 @@
 #include <cstdint>
 #include <tuple>
 #include <mutex>
+#include <cmath>
 
 #endif