Help wanted issues (but NOT `good first issue`)

Help wanted to work on the following items, but these ones should NOT be considered as "good first issues". Non-trivial contribution experience is expected.

Relatively easy:

• #5285
• #5295
• #5160

Medium:

• #4766
• #368
  • #5312

Difficult:

• #4371
  • #5495
• #4326
• #3033

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• Contributors: if you are interested in working on these items, please show your interest with detailed design proposal in the corresponding issue ticket (NOT in this umbrella ticket)
• Maintainers: feel free to edit the list