filesystem_spec
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Call cat_ranges in blockcache for async filesystems
The CachingFileSystem can benefit from calling cat_ranges for asynchronous filesystems to concurrently download blocks. This speeds up filling the cache significantly for filesystems like HTTP and S3FS.
Sorry I let this one slide - I still think it's useful. I have just the one comment above.
Can you please solve the conflict, and I can have another look?