Health check type comparisons for joins

Hi,

toad health check shows for the check of type matching of join columns number vs number(8) as an issue.

For my part i dont see any reason for this as there is no physikal difference in those two and i wonder if there will ever be an implicit type conversion in those cases.

Any justification for the check marking this "mismatch" as an potential performance impact that i am not aware?

Thanks in advance!

Regards chris