If you use this command
/give @p potion{CustomPotionEffects:[{Id:1,Duration:1000,Amplifier:-5}]}
You get a potion that gives you speed 1 instead of -4.
This might be intentional, but I'm pretty sure a while back negative amplifiers worked and a speed -4 potion would have slowed you down.
I also noticed that an Amplifier greater or equal to 128 has the same effect, but at Amplifier 256 and greater it sort of warps back to 0 and Amplifier 257 would act the same as Amplifier 1. Similar effect for negative amplifiers at -129 or below.
Linked issues
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