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If an io! block occurs in a transaction, throws an IllegalStateException, else runs body in an implicit do. If the first expression in body is a literal string, will use that as the exception message.
prepl bound to *in* and *out*, suitable for use with e.g. server/repl (socket-repl). :ret and :tap vals will be processed by valf, a fn of one argument or a symbol naming same (default pr-str) Alpha, subject to change.