I don't think multiple checksums are allowed: https://developers.cloudflare.com/r2/api/workers/workers-api-reference/#r2putoptions

Note
Only a single hashing algorithm can be specified at once.

That said, this would be better if we ever relaxed that requirement in the future. However I think it's harder to query, so I'm a little torn.

Alternatively, we could just set the first seen checked in a preset order.

And/or post under a different tag, checksum2 or something along those lines.

Only a single hashing algorithm can be specified at once.

That may be true, but I noticed that doesn't hold all the time.

@jmorrell-cloudflare LMK what you prefer

CodSpeed Performance Report

Merging #5252 will not alter performance

_{Comparing mar/stw-r2-checksum-dup (3c3e8b6) with main (8e90d6d)}

Summary

✅ 34 untouched
⏩ 9 skipped¹

@fhanau confirmed with R2 that it's standard to have multiple checksums, so it's something we should support.

For ease of use, we can still designate one (picked in set order) set under some generalized checksum tag, in addition to this.

If multiple checksums are allowed, then I'm fine merging this as-is