> edge cases like billions of files Sometimes edge cases can quickly detect bugs that only happend rarely under normal circumstances and therefore is difficult

> edge cases like billions of files Sometimes edge cases can quickly detect bugs that only happend rarely under normal circumstances and therefore is difficult to reproduce/debug. E.g. when programming in C for little endian computers it can be a good idea to test code on big endian CPUs as the difference in endianess can reveal "out of bounds" writes for pointers.