Tracking issue

[hauntsaninja]

This issue is a living list of things that could be improved, not exhaustive, just a scratchpad for my personal use:

• Refactor globals to use contextvars / per-event loop state
• ~xmltodict might be pretty slow~
• Make use of FilterBoostable, more tests
• Better wildcard support
• Optimistic authorisation (maybe not worth it)
• Implement anonymous auth (aka figure out why it doesn't work, possibly Azure API version difference)
• ~Progress bars (decided not to do this, what we have works well)~
• ~Investigate https://docs.microsoft.com/en-us/rest/api/storageservices/copy-blob-from-url~
• ~Improve EagerAsyncIterator, implement backpressure for it~
• ~More options for sync, e.g. exclude~
• ~Cache authorisation on disk~