public Property ToStringOutputIsDifferentForDifferentFormats(TBoundary boundary, FormatString firstFormat, FormatString secondFormat) =>
(!firstFormat.Equals(secondFormat)).
Implies(!Result.From(() => boundary.ToString(firstFormat, null)).Equals(Result.From(() => boundary.ToString(secondFormat, null)))).
When(boundary.IsValid &&
!Result.From(() => default(TComparer).ToString(boundary.Value, firstFormat, null)).Equals(
Result.From(() => default(TComparer).ToString(boundary.Value, secondFormat, null)))).
Or(!boundary.IsValid || !(boundary.Value is IFormattable));
