[reactive] mappend laziness issue

[Sasha Rush]

I started playing with reactive again and got stuck on a laziness issue with
mappend. My codes pretty simple, two events controlled by legacy adapters,
one and two. I'm combining them with mappend.

both = one `mappend` two

For some reason the events get clogged up. So for the first "one" event to
fire, a "two" needs to come through, and sometimes vice-versa. It's possible
I'm misunderstanding how mappend works, but the docs make it seem that both
should fire whenever either fires.

Thanks in advance.
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