A complex number made with downcasting off prints as a different number once downcasting is back on #1610

What you ran:

Entity.Number.Complex z;
using (MathS.Settings.DowncastingEnabled.Set(false))
    z = Entity.Number.Complex.Create(EDecimal.FromString("1"), EDecimal.FromString("-0.3333333333333333333333333333333333333333"));
Console.WriteLine(z);

What it did: Printed 1 - 1/3i. The parser reads that back as 1 - 1/(3i), which is 1 + i/3. Printed inside the scope, the same number is 1 - 0.3333333333333333333333333333333333333333i. A small imaginary part is lost altogether: erfc(16 - 0.5i), evaluated with downcasting off, prints as -2.8337...E-113 - 0i, though its imaginary part is -9.4899...E-114. Latexize does the same.

What it should have done: Print the number it holds, whatever the setting is when it is printed.