Strange behavior with opAssign and static if

[Stanislav Blinov]

__traits(allMembers) gives you *all* members, including methods 
(even implicit).
As soon as you define opAssign for your Decimal, it gets defined 
for OrderDb too, and then you try to assign to it :)

What you need is something like this:

void execute(T)(T struc){
	Variant[] arr = new Variant[](2);

	foreach(i, member; struc.tupleof) {
		static if (isInstanceOf!(Decimal, typeof(member))){
			// Store decimals as string
			arr[i] = member.toString();
		} else {
			// Store other values with their types
			arr[i] = member;
		}
	}
}