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Update simple-serialize.md

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@ -83,8 +83,8 @@ Given a type, serialization is an injective function from objects of that type t
We first define helper functions: We first define helper functions:
* `pack`: Given ordered objects of the same basic type, serialize them, pack them into BYTES_PER_CHUNK-byte chunks, right-pad the last chunk with zero bytes, and return the chunks. * `pack`: Given ordered objects of the same basic type, serialize them, pack them into `BYTES_PER_CHUNK`-byte chunks, right-pad the last chunk with zero bytes, and return the chunks.
* `merkleize`: Given ordered BYTES_PER_CHUNK-byte chunks, right-pad them with zero chunks to the next power of two, Merkleize the chunks, and return the root. * `merkleize`: Given ordered `BYTES_PER_CHUNK`-byte chunks, right-pad them with zero chunks to the next power of two, Merkleize the chunks, and return the root.
* `mix_in_length`: Given a Merkle root `root` and a length `length` (`uint256` little-endian serialization) return `hash(root + length)`. * `mix_in_length`: Given a Merkle root `root` and a length `length` (`uint256` little-endian serialization) return `hash(root + length)`.
We now define Merkleization `hash_tree_root(value)` of an object `value` recursively: We now define Merkleization `hash_tree_root(value)` of an object `value` recursively: