Comment by zzo38computer

> EDN also has no builtin 'raw bytes' type.

That was my complaint too.

> I am working on a format consisting of serialized B-tree. It is essentially a dictionary, but serialized

I had wanted something a bit similar; a serialized B-tree (or a similar structure) but with only a 'raw bytes' type, for keys and values (I will use DER for the values; I have my own library to work with DER already), and the ability to easily find all records whose key matches a specified prefix.