The simplest upgrade to the classic indicator, old script:
B3 Stochastic Full
Also, if you like this one you may appreciate my personally modified take on the stochastic readings:
B3 Extended Stochastics
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.