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a621198a03
The Ryu algorithm is very fast with its table, but that table grows too large for long doubles. This patch adds a method of calculating the digits of long doubles using just wide integers and fast modulo operations. This results in significant performance improvements vs the previous int calc mode, while taking up a similar amound of peak memory. It will be slow in some %e/%g cases, but reasonable fast for %f with no loss of accuracy.