The Reserve Bank of India’s historic defense of the rupee bought the currency some reprieve, but at a steep cost.The rupee is set for a 1.9% advance this week, its biggest weekly gain in four years. Yet liquidity in parts of the foreign-exchange market is drying up, hedging costs have jumped to a decade-high and bond yields have reached their highest level in more than three years.BloombergThe RBI’s most aggressive currency intervention in more than a decade is rippling across India’s financial markets.