Missing delete_fluid_midi_driver on Synth.delete()?

[EmoonX]

When killing a FluidSynth instance, a few deletion routines are called:

if self.audio_driver:
    delete_fluid_audio_driver(self.audio_driver)
delete_fluid_synth(self.synth)
delete_fluid_settings(self.settings)

However, delete_fluid_midi_driver isn't among them. As a matter of fact, it isn't called anywhere in the code.

Listing MIDI output ports shows the FS instance still there:

$ aplaymidi -l
 Port    Client name                      Port name
 14:0    Midi Through                     Midi Through Port-0
128:0    FLUID Synth (2085)               Synth input port (2085:0)

By defining the aforementioned binding (delete_fluid_midi_driver = cfunc('delete_fluid_midi_driver', c_void_p, ('driver', c_void_p, 1)) and adding it to the deletion routines (delete_fluid_midi_driver(self.midi_driver)), the instance is finally cleared as it should:

$ aplaymidi -l
 Port    Client name                      Port name
 14:0    Midi Through                     Midi Through Port-0