I assume that @martinjuckes meant that some CMIP files might say `noleap` and 
others `365_day`. I don't think he meant that there are existing files in which 
 `noleap` was used on the coordinate variable and `365_day` on the bounds, for 
example, but he was concerned that this might currently be allowed. This 
proposal would disallow it. If there are any such datasets, they would be 
invalidated by the next version of the conventions, but not by the version they 
were written with, of course. In general we don't like even this sort of 
backward-incompatibility but I think it's harmless in this case. If software 
chose to rely on the new convention and assume that the bounds had the same 
calendar as the coordinates without checking, the outcome would still be OK if 
it's equivalent although not exactly the same string.

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