Log for on 30th January 2014:
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20:16:51  <frosch123> hmm, should vehicle var 61 set "available = false" when used in disallowed callbacks instead of returning 0 ?
20:20:17  * Alberth hopes you're not asking me :)
20:21:44  <Alberth> ...If the offset is outside the vehicle chain, the result value will be 0.  <-- isn't it doing that already?
20:22:51  <frosch123> "It is not supported during a callback that is used to modify vehicle properties to avoid circular dependencies, which currently limits this variable to callbacks 1D, 2D, 31 and 32 plus outside callback scope." <- i am refering to that case of invalid grf
20:24:49  * Alberth nods
20:25:38  <Alberth> apparently "not a valid offset" is different from "available = false" for you
20:27:58  <frosch123> well, the point is, returning zero is not the same as returning "not available"
20:28:12  <Alberth> I understand that now :)
20:28:32  <frosch123> "not available" results in debug output and a throw-like special grf behaiour
20:28:35  <Alberth> and yes, it makes sense to say "we don't have that callback in those cases, I think"
20:29:00  <Alberth> s/, I think"/", I think/
20:44:47  <planetmaker> frosch123, how would a newgrf behaviour change (from user perspective) if it currently uses it?
20:45:37  <frosch123> "not available" means aborting the current switch (skipping register assignments and such), and immediately continue with the default case
20:46:28  <planetmaker> ah. yes, sounds reasonable then
20:46:29  <frosch123> it's a weird thing, but the positive aspect would be that could list it as bug
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