Processor problems have been in the news lately, due to the Meltdown and Spectre vulnerabilities. But generally, engineers writing software assume that computer hardware operates in a reliable, well-understood fashion, and that any problems lie on the software side of the software-hardware divide.
Cloudflare has an automatic image optimization feature called Polish, available to customers on paid plans. It recompresses images and removes unnecessary data so that they are delivered to browsers more quickly. Up until now, Polish has not changed image types when optimizing (even if, for example, a PNG might sometimes