I always imagined a writing system that used uppercase/lowercase to be "before and after a decmial point" without an explicit decimal. Like how some advertisin

I always imagined a writing system that used uppercase/lowercase to be "before and after a decmial point" without an explicit decimal. Like how some advertising material renders "$499.99" as 499 in a large size, followed by 99 in a smaller, often superscript style, and no discrete decimal.