New version of data.table leading to an error when using scoringutils

[seabbs]

The epinowcast integration of scoringtutils has been failing its tests since the CRAN release of the new version of data.table (last week). It looks like the core issue is localised to score() and so may need to be resolved here vs in epinowcast. Alternatively it may be that the epinowcast issue is due to an unsupported edge case and so can be fixed there. If that is the case though a documentation update is likely needed here flaggin that edge case more clearly.

See epinowcast/epinowcast#198 for more on the issue and a reprex reproducing it.

[seabbs]

@nikosbosse any leads on this or reports of it in other usage?

[nikosbosse]

Main discussion here: epinowcast/epinowcast#198
Proposed solution in #274