[ic] 5.0.0 Upgrade - Merge Metadata?

[music at labyrinth.net.au]

Am in the process of upgrading some catalogues to 5.0.0 that have been
running nicely under 4.8.7

Have followed the UPGRADE instructions and all appears well.

However the 'Merge Metadata' process in the new UI is a little confusing.

Is there some more specific info about this process somewhere? (Have done a
fair amount of searching.)

How dangerous is it to 'Merge All' for older foundation catalogues?

When comparing data to merge what does it mean if the new value is 'Table'
the older value is 'text'? What if I merge these values? What else would I
need to look at updating?

What type of things should not be merged and left as is?

Thanks!