stream: fix dropped first chunk in Utf8Stream buffer mode#63833
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Signed-off-by: Daijiro Wachi <daijiro.wachi@gmail.com>
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In buffer content mode, #writeBuffer pushed an empty array when starting a new batch (including the very first write), so the data buffer was never stored while its length was still recorded in lens. The first write then emitted zero bytes and the misaligned bufs/lens queues crashed in mergeBuf() with a TypeError. Push [data] instead, matching the upstream sonic-boom implementation.