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I added 3 fixes:
Removed the rounding in the RSI calculation so the number is more precise
Fixed the hardcoded percentages, they were swapped.
Note: these numbers are the same as the calculation in case the period is not 12 or 26. I imagine these values are rounded and hardcoded for some specific use case. Maybe they can be removed and use the universal formula instead?
(lines 65-67 of lib/ruby_technical_analysis/indicators/moving_averages.rb)