In this Stackoverflow question the inquirer points out the following discrepancy in an error message:

In [5]: np.delete(x, x == a)
/usr/lib/python2.7/dist-packages/numpy/lib/function_base.py:3254: FutureWarning: in the future insert will treat boolean arrays and array-likes as boolean index instead of casting it to integer
  "of casting it to integer", FutureWarning)

Since the warning is produced by a call to delete() it would be better if the message didn't refer to a specific function.

Also, why does the string "of casting it to integer" appear at the end of the warning message?