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These errors all mean something is going very wrong.

Update deps:

* Switch to multiformats/go-base32
* Regenerate protobuf decoding code

Motivation: Walking the datastore can take time and currently blocks
adding/removing providers.

We need to do this in the same goroutine to avoid some logical races.

Otherwise, we'll delete everything.

1. Don't be n^2.
2. Don't bother walking the cache, just drop it.

We only access it from a single goroutine.

This is just extra work as we write through anyways.

License: MIT
Signed-off-by: Jason Chang <ridewindx@163.com>

Try to preallocate slices up-front instead of repeatedly reallocating.

License: MIT
Signed-off-by: Vasily Kolobkov <polezaivsani@openmailbox.org>

License: MIT
Signed-off-by: Vasily Kolobkov <polezaivsani@openmailbox.org>

Cache miss might mean that provider records where offloaded to
datastore and need to be brough back up in order to have a consistent
cache entry.

License: MIT
Signed-off-by: Jeromy <why@ipfs.io>