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Make flatfs robust

It's a no-op if we don't need it.

Only allow keys of the form `/[0-9A-Z+-_=]`. That is, upper-case alphanumeric
keys in the root namespace (plus some special characters).

Why? We don't encode keys before writing them to the filesystem. This change
ensures that:

1. Case sensitivity doesn't matter because we only allow upper-case keys.
2. Path separators and special characters doesn't matter.

For context, go-ipfs only uses flatfs for storing blocks. Every block CID is
encoded as uppercase alphanumeric text (specifically, uppercase base32).

We could be less restrictive, but this is safer and easier to understand.
Unfortunately, we _can't_ allow mixed case (Windows) and can't allow lowercase
because we're already using uppercase keys.

fixes #23

That way, we're finally implementing everything.

While this datastore is still quite limited, we might as well support everything
we easily can.

chore: update go-datastore

And better handle prefixes.

Bump github.com/ipfs/go-datastore from 0.3.0 to 0.3.1

Bumps [github.com/ipfs/go-datastore](https://github.com/ipfs/go-datastore) from 0.3.0 to 0.3.1.
- [Release notes](https://github.com/ipfs/go-datastore/releases)
- [Commits](https://github.com/ipfs/go-datastore/compare/v0.3.0...v0.3.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Update Datastore Interface

query: deny ReturnsSizes and ReturnExpirations instead of returning wrong result

Bump github.com/ipfs/go-datastore from 0.1.0 to 0.1.1

Bumps [github.com/ipfs/go-datastore](https://github.com/ipfs/go-datastore) from 0.1.0 to 0.1.1.
- [Release notes](https://github.com/ipfs/go-datastore/releases)
- [Commits](https://github.com/ipfs/go-datastore/compare/v0.1.0...v0.1.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

doc: add a lead maintainer

make delete idempotent

(faster)

remove thread-safe assertion

Merge before: https://github.com/ipfs/go-datastore/pull/120

fix panic on write after close

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

1. Use []byte instead of interface{}.
2. Handle rename errors.
3. Correctly temporary files.

(and make Close threadsafe)

fix a goroutine leak killing the gateways

Closing a query early could leak the query goroutine if the buffer isn't large
enough to fit the rest of the query.