both the fixed-size array byte, bytes1...bytes32, and the dynamic array bytes types in Solidity

https://solidity.readthedocs.org/en/latest/types.html#fixed-size-byte-arrays

bytes1, bytes2, bytes3, ..., bytes32. byte is an alias for bytes1.

https://solidity.readthedocs.org/en/latest/types.html#dynamically-sized-byte-array

bytes: Dynamically-sized byte array

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