I've commented it extensively, so that it might be useful for people learning Pinescript. Enjoy!
Added comment to f_trail function to make it more portable.
Fixed edge cases where a wick causes us to try to flip both long and short.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.
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