The getblocktemplate RPC method accepts a parameter, reserve_size. What does it do and what are its valid values?

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The reserve_size is the amount of data to reserve in the block template for the extra nonce (arbitrary data which may be embedded in a transaction). The maximum amount is 255 bytes. This is used by the pool code to place a nonce which will be incremented to try to find a block hash below the current difficulty target.

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