convert-ly #'details

[Fairchild]

convert-ly 2.4.6 to 2.8.5 changes

\override Stem #'lengths = #'(2.45 2.45 2.45 3.15 3.5)
\override Stem #'beamed-lengths = #'(2.282 2.282 1.05)
\override Stem #'beamed-minimum-free-lengths = #'(1.281 1.05 0.875)
\override Stem #'beamed-extreme-minimum-free-lengths = #'(1.75 1.4 0.7)

to

\override Stem #'lengths = #'(2.45 2.45 2.45 3.15 3.5)
\override Stem #'details #'beamed-lengths = #'(2.282 2.282 1.05)
\override Stem #'details #'beamed-minimum-free-lengths = #'(1.281 1.05
0.875)
\override Stem #'details #'beamed-extreme-minimum-free-lengths = #'(1.75 1.4
0.7)

missing one #'details.

The stem length result also changes.  Haven't yet experimented enough to
discover exactly how.  Is it known and documented?

Why the change anyway?

                                 - Bruce