mkInterval behaves oddly for negative number component

music-suite / music-pitch

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mkInterval behaves oddly for negative number component #40

Closed hanshoglund closed 10 years ago

hanshoglund commented 10 years ago

>>> mkInterval Perfect (-4)
-_P4
>>> 
>>> mkInterval Perfect (-5)
-_P5
>>> 
>>> mkInterval Minor (-5)
-*** Exception: qualityToDiff: Unknown interval expression (PerfectType, Minor)
>>> 
>>> mkInterval Minor (-3)
-m3
>>> mkInterval Major (-3)
-d3```