[Bro-Dev] more set operators? (equality/subset)

[Vern Paxson]

> I assume what will at the moment happen with sets is that the pointers of
> records are checked for equality

Specifically, in my branch they are checked for whether the composite hash
index matches.  Happily, this works:

	type A: record {
		a: string;
	};

	event bro_init()
		{
		local i = A($a="a");
		local j = A($a="a");
		print set(i) | set(j);
		}

when run prints

	{
	[a=a]
	}

and if you change j to be $a="b" then you get:

	{
	[a=b],
	[a=a]
	}

This in fact suggests we could implement record equality by converting the
records to hash indices and then comparing those.

		Vern