chunk key encoding: c prefix for 0-dimensional arrays

[d-v-b]

can someone help me understand the behavior of 0-dimensional arrays with the default chunk key encoding?

The spec states:

Arrays may have 0 dimensions (when for example representing scalars),
in which case the coordinate of a chunk is the empty tuple, and the chunk key
will consist of the string c.

I interpret this to mean that c is a prefix / directory for 1+dimensional arrays, but c is an object / file for 0 dimensional arrays, which seems strange. Why did we move away from the behavior in V2 (a 0D array has 1 chunk, named 0)?