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Reduce per-query allocations for protocol messages - #270
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sync(), flush(), describe_portal(""), and execute_msg("", 0) produce
identical output on every call. The Pony compiler interns Array[U8] val
literals as static data in .rodata — zero allocation, single lea.
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sync(),flush(),describe_portal(""), andexecute_msg("", 0)produce identical output on every call. The Pony compiler internsArray[U8] valliterals as static data in.rodata— zero allocation per call, singleleareturning a pointer.sync()andflush()replace the entire body.describe_portal()andexecute_msg()add a fast path for the common empty-portal / zero-max-rows case; the general path is unchanged.