Oh yes sorry you're right. When using alphanumeric mode you only get a small amount of binary encoding bloat (3%) with base45. But even with binary data encode

Oh yes sorry you're right. When using alphanumeric mode you only get a small amount of binary encoding bloat (3%) with base45. But even with binary data encoded to baseXX, you still need to decide what the byte stream means. I was mainly looking at how to efficiently encode a hierarchical document containing the most common data types (that anyone can decode and inspect) into a QR code.