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cache_device: mount with `-o discard`

Flash-based storage benefits greatly from the OS periodically sending trim commands to free blocks. This leads to massively-increased performance when the drive would otherwise have to first free a block before re-using it.

It should be safe to mount any drive with the discard command, so let's just do that :)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information