Expose INumber<Int512>.Sign().

Author: crookseta

src/MissingValues/Int512.Implementations.cs

@@ -451,6 +451,23 @@ public static Int512 Parse(ReadOnlySpan<byte> utf8Text, IFormatProvider? provide
 		/// <inheritdoc/>
 		public static Int512 RotateRight(Int512 value, int rotateAmount) => (value >>> rotateAmount) | (value << (512 - rotateAmount));
 
+		/// <inheritdoc/>
+		public static int Sign(Int512 value)
+		{
+			if ((long)value._p7 < 0)
+			{
+				return -1;
+			}
+			else if (value != Zero)
+			{
+				return 1;
+			}
+			else
+			{
+				return 0;
+			}
+		}
+
 		/// <inheritdoc/>
 		public string ToString([StringSyntax(StringSyntaxAttribute.NumericFormat)] string? format, IFormatProvider? formatProvider)
 		{