Hi @davidhassell : thanks. 

There is a use case for providing attributes on bounds variables in the Trac 
ticket which you cited ([140](https://cf-trac.llnl.gov/trac/ticket/140)) : 
@taylor13 describes a usage where the user needs to know the `units` of the 
bounds variable and does not make use of the parent coordinate variable. 
However, the more important point, I think, is that the status quo is clearly 
that use of these attributes on the bounds variables is clearly deprecated and 
not forbidden. Changing that would, as you say, be a discussion for another 
issue. 

@JonathanGregory , @taylor13 : can you help with the interpretation of the 
intention of the discussion in [Trac 
140](https://cf-trac.llnl.gov/trac/ticket/140) on the precise rule for 
`calendar` attributes on bounds variables? In particular, if a variable has 
`calendar = noleap`, would `calendar = 365_day` on the bounds be:

- (A) deprecated as being the same but redundant or 
- (B) forbidden as being a different string (not exactly the same, even though 
it has exactly the same meaning)? 

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