"minor fourth" and "minor fifth"

[hesyifei]

If I'm not mistaken, "minor fifth" and "minor fourth" do not exist. However, mingus seems to have both "minor fifth" and "diminished fifth" (and "minor fourth" and "diminished fourth") and treat them differently.

For example, Ab -> Ebb should have been a diminished fifth (and I don't know if there's any name for Ab -> Ebbb).

>>> intervals.determine("Ab", "Ebb")
'minor fifth'
>>> intervals.determine("Ab", "Ebbb")
'diminished fifth'

and C -> Fb should have been a diminished fourth

>>> intervals.determine("C", "Fb")
'minor fourth'
>>> intervals.determine("C", "Fbb")
'diminished fourth'

The same problem goes for the from_shorthand function:

>>> intervals.from_shorthand("C", "bb4")
'Fbb'

I would have expected this to return 'Fb' since the doc says "‘bb’ the diminished".

It would be great if this could be fixed. Thanks!