even linspace is buggy in numba

bob/measure/_library.py

@@ -731,10 +731,12 @@ def epc(
     # if not pre-sorted, copies and sorts
     dev_neg = dev_negatives if is_sorted else numpy.sort(dev_negatives)
     dev_pos = dev_positives if is_sorted else numpy.sort(dev_positives)
-    # numpy.linspace is more stable than numpy.arange for non-integer steps
-    # using 1 + eps instead of 1.0 in numpy.linspace to avoid
-    # https://github.com/numba/numba/issues/6768
-    alpha = numpy.linspace(0, numpy.nextafter(1.0, 1.1), n_points)
+    # numpy.linspace is more stable than numpy.arange for non-integer steps.
+    # However, both arange and linspace are buggy in numba. Using objmode for a
+    # workaround. TODO(amir): remove objmode once
+    # https://github.com/numba/numba/issues/6768 is resolved.
+    with objmode(alpha="float64[:]"):
+        alpha = numpy.linspace(0, 1.0, n_points)
     thres = numpy.empty_like(alpha)
     mwer = numpy.empty_like(alpha)
     for i, k in enumerate(alpha):