SpanMode.breadth -- misnomer?

[%u]

It seems to me that the SpanMode.breadth option when enumerating a
directory does not actually do breadth-first search, but rather
performs a kind of depth-first "preorder" traversal.

In other words, to me, this is depth-first "postorder" traversal:

\A
\A\1
\A\1\x
\A\1\y
\A\2
\B
\B\1

whereas this is depth-first "preorder" traversal:

\A\1\x
\A\1\y
\A\1
\A\2
\A
\B\1
\B

and whereas **this** is a true breadth-first traversal:

\A
\B
\A\1
\A\2
\B\1
\A\1\x
\A\1\y


Is that correct, and so is "breadth" actually a misnomer? I found it
really confusing that it didn't work level-by-level.