nit

Author: NoureldinYosri

tunits/core/cython/frac.pyx

@@ -85,7 +85,7 @@ cpdef frac float_to_twelths_frac(a) except *:
 
     cdef double d = float(a)
     cdef long long x = <long long>c_floor(12*d + 0.5)
-    if fabs(12*d - x) > 1e-5:
+    if c_fabs(12*d - x) > 1e-5:
         print('spit', d, x, 12*d - x, a, '%.20f'%d, '%.20f'%a, '%.20f'%(12*d))
         raise ValueError("Not a twelfth.")