anchor.diff:      /// <summary>Returns the string interpretation of the specified BigInteger in numeric base 8. Equivalent
       ///   to ToString(8).</summary>
       function ToOctalString: string;
  -
  -    procedure FromString(const Value: string);
   
   
       // -- Arithmetic operators --
  
positive.code:     Error(ecParse, Value);
  end;
  
  class operator BigInteger.Explicit(const Value: BigInteger): Double;
  begin
    Result := Value.AsDouble;
  end;
  
  class operator BigInteger.Explicit(const Value: Double): BigInteger;
  
negative.code:         LEA     ESI,[ESI + CUnrollIncrement*CLimbSize]
          LEA     EBX,[EBX + CUnrollIncrement*CLimbSize]
  
          LOOP    @RestLoop
  
  @RestLastN:
  
  