Indian rupee traders are approaching the New Year with caution, as the Reserve Bank of India's significant interventions in December largely dictated the currency's movement, overshadowing market fundamentals. With low trading volumes expected due to holidays, the rupee is anticipated to open flat and trade within a narrow range. The RBI's aggressive dollar sales aimed to support the rupee, establishing the 90 level as a potential soft defense line amidst underlying unsupportive flows and the dollar index's performance.