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Vincent Lefevre schrieb:
On 2009-08-07 09:32:51 +0200, Arnold Neumaier wrote:Vincent Lefevre schrieb:Note that in the other example of missing data (for min function), the payload wouldn't solve the problem as the result does not depend on the payload.Why not? min(x,Missing)=x, but min(x,Malformed)=Malformed, so the payload can be used to distinguish the two cases and create the correct result.Yes, but then the sentence It propagates through all interval operations. in the motion should be removed or modified.
The motion was for having a unique NaI, in which case the propagation rule is OK.
But I think there should either be no NaI (which I'd favor), or there should be NaI with payload. Thus I think the motion should not be supported. To prepare for a possible NaI with payload and to estimate its likely cost, those interested in having NaI should, as John Pryce suggested in another mail, collect the desired uses for NaI and which propagation rules these uses imply. Arnold Neumaier