Eliminate a been_tapped race.

[donaldh]

This resolves the race condition between more and first tap.

[donaldh]

[23:26] jnthn donaldh: oh, but I don't like/want that solution
[23:26] donaldh oh.
[23:26] donaldh Well it corrects the current solution
[23:26] jnthn Yeah, but it adds a dependency on something I don't think is the right way to solve the problem...
[23:27] donaldh okay. np
[23:27] lizmat could we at least pull this? so at least this solution doesn't race ?
[23:27] jnthn Knowing that fixes it for you is worthwhile, though...since it means the thing I have in mind (Supply.on_demand(-> $s { ... }) will do it.
[23:27] donaldh I didn't realise you had bigger change planned.
[23:28] lizmat so, shall I pull it ? For now ?
[23:28] jnthn lizmat: So I can revert it and replace it in a day or two's time?
[23:28] donaldh It allows me to get on with writing spectests for Async io
[23:28] jnthn donaldh: True, though you could do that with it applied locally
[23:28] donaldh Yep. Happy to.
[23:29] lizmat if it's only a day or two, then by all means, don't let me stop you
[23:29] jnthn Yeah. I have a full day for Perl 6 things on Thursday so can certainly get to it then.
[23:30] lizmat cool
[23:30] donaldh jnthn++