message: Fix routing to Python math lib for round and sec
diff: @@ -1098,7 +1098,7 @@ def round(a):
  if isinstance(a, ArrayBase):
  return a.round_()
  else:
  - return _math.round(a)
  + return round(a)
  def trunc(a):
  @@ -1476,7 +1476,7 @@ def sec(a):
  if isinstance(a, ArrayBase):
  return a.sec_()
  else:
  - return 1 / _math.sec(a)
  + return 1 / _math.cos(a)
  def cot(a):
  @@ -1580,7 +1580,7 @@ def erfinv(a):
  if isinstance(a, ArrayBase):
  return a.erfinv_()
  else:
  - return _math.erfinv(a)
  + raise Exception("erfinv(): only implemented for enoki types!")
  def lgamma(a):
  