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Optimize decoding

This way, we can't blow out our stack.

We use this quite frequently so it should be fast.

Note: this removes the depth restriction because the algorithm is no longer recursive.

Type asserting to a concrete type is ~10x faster than type asserting to an
interface. This change has a significant performance impact in my test. readByte
used to account for 10.8% of the time, now it accounts for 3.4%.

Buffering could lead to reading over the end of the object, corrupting the next object.

This patch also gets rid of "PeekByte" and uses the standard ReadByte/UnreadByte
interfaces. That way, we can avoid wrapping the byte reader in the happy path,
saving some overhead.

Fix named string issue

Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

Fix encoding/decoding fixed byte arrays

fix overread on scanforlinks

chore: update go-cid and remove xerrors

correctly map typegen to cbg in all cases

fix: clear struct state on unmarshal

We needed this to apply to maps, slices, etc.

deferred: restrict max length

reduce number of allocations in ScanForLinks

fixes #21

We could also make sure every field write writes to the field, no matter what.
However, this is much safer.

attempt to allocate less by using shared buffers

use new cid methods for less allocs

properly handle roundtripping Deferred with 'null' value

Support array types

Handle Nil values for cbg.Deferred