This is in ASDF 1.86.
When the system definition uses explicit `:in-order-to'
dependencies between files, and I issue a command like
`(asdf:operate 'asdf:load-op <system>)', it recompiles
many files unnecessarily (the fasls are up to date
already). This doesn't happen when the system
definition is in `:serial t' form.
I enclose a tentative fix.