* Yen tentatively up ahead of PM vote in Japan * Investors expect greater government spending under Takaichi * Currencies rangebound; overall market mood buoyant By Rae Wee SINGAPORE, Oct 21 (Reuters) – The yen held steady on Tuesday, ahead of a parliament vote in Japan later in the day that is almost certain to see hardline conservative Sanae Takaichi become the country's first female prime minister. Currencies were mostly rangebound in the early Asian session, with the dollar little changed as an ongoing U.S. government shutdown left investors flying blind on data ahead of next week's Federal Reserve meeting. The yen was last 0.1% stronger at 150.61 per dollar, having fallen slightly in the previous session as investors anticipated that Takaichi's likely premiership – following the backi

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