fix NA filled by shift(nanotime, fill=NA) #3942
Merged
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Closes #3945
Currently
shift(nanotime(1:4))
incorrectly fills anumeric
NA
rather than aninteger64
NA
into the result vector. This is because we incorrectly check that the class is exactlyinteger64
, rather than inherited from it, as we do in most other contexts. This PR fixes that, and adds test cases for shift called on nanotimes.