var_name preventing cube merging

[djkirkham]

Cubes and coords with different var_name attributes won't merge.

I believe this shouldn't be the case, as var_name is just an artefact of the netCDF file and has no bearing on the meaning of the actual data, unlike standard_name and long_name.

It's also quite difficult to tack down the reason for cubes failing to merge in this case.

[lbdreyer]

Looks like this is a duplication of an existing (4 year old!) issue: #512

[github-actions]

In order to maintain a backlog of relevant issues, we automatically label them as stale after 500 days of inactivity.

If this issue is still important to you, then please comment on this issue and the stale label will be removed.

Otherwise this issue will be automatically closed in 28 days time.

[github-actions]

This stale issue has been automatically closed due to a lack of community activity.

If you still care about this issue, then please either:

• Re-open this issue, if you have sufficient permissions, or
• Add a comment pinging @SciTools/iris-devs who will re-open on your behalf.