Optional monitors suggestion

[Sean Kelly via Digitalmars-d]

Yeah I haven't looked at the implementation yet either.
Currently, it's possible to set a core.sync.Mutex as an object
monitor.  Would this capability be preserved?  Someone mentioned
a hashtable of monitors... do we really need this?  I can see the
desire to preserve existing semantics and so a user shouldn't
have to explicitly construct a monitor to use synchronized since
they don't today, but it should still be possible to do so if the
user has some need to.