Daniel Barkalow [off-list ref] writes:
... (That is, you
want the head of an unreachable chain listed for recovery, but not other
things reachable from it; you also may want the list of blobs and trees
not reachable either from a ref or from something listed for recovery, but
not omitting a blob reachable only from an unreachable tree)
I thought that was what those 'dangling blah' was about...
That is, if you make commit A and then on top of that commit B,
and lose both, you will see dnagling for B but not A (which is
reachable from B).