Sorry, not sure I see the point here other than computers provide human representation of binary data? If the mapping is non trivial then unless you're careful

Sorry, not sure I see the point here other than computers provide human representation of binary data? If the mapping is non trivial then unless you're careful you end up breaking basic consistency between input and stored data hence the weird issues with mangling the unicode chars. If the mapping is trivial theres almost nothing to discuss. If the mapping is many to many you're going to have a bad time unless your consistent with your use of the maps. Then the fun is broken mappings where you get data loss due to incorrect many to one and one to many mappings. There are times when caps matter, I e. code and filesystems are human readable so should not be arbitrary, but searching these for instance makes sense to be insensitive when needed (perhaps even default)