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Defines traits for blocking (synchronous) and non-blocking (asynchronous) communication with a Solana server as well a a trait that encompasses both.
//! Synchronous implementations are expected to create transactions, sign them, and send them with multiple retries, updating blockhashes and resigning as-needed.
Asynchronous implementations are expected to create transactions, sign them, and send them but without waiting to see if the server accepted it.