Summary

Split out from #30979 (comment)

For a start, I just cite the summary of the above comment. A more compelete writeup will follow later.

Mid-term: (larger project)
Revisit the architecture and handling of artist properties, including

• fundamental design decisions MNT: remove redundant normalization from set #30979 (comment)
• usage in signatures MNT: remove redundant normalization from set #30979 (comment)
• need for normalization in set, (including whether it needs to detect duplicates) MNT: remove redundant normalization from set #30979 (comment)
• completion support MNT: remove redundant normalization from set #30979 (comment)

Proposed fix

No response