Cloudflare's R2 supports case sensitive user-defined metadata keys. For instance, the APFS too.
However, rclone does not: Documentation
When copying/syncing objects using the --metadata flag, the metadata is downloaded. However, the keys are all in lowercase. Accordingly, one loses information.
It would be great if rclone preserved the case of the metadata keys.
I assume rclone is currently fetching the x-amz-meta- headers and interpreting them as lowercase. Could the part after that prefix be interpreted as case sensitive?