Hello!

I am new to Numba and I have been having some troubles with the data types, I tried to convert an np.int64 to np.int32, I kept tracing and discovered that the problem was the conversion from int64, however I have no clue of what could I try to solve it:

`Cannot cast array(int64, 1d, C) to int32: %".7980" = load {i8*, i8*, i64, i64, i64*, [1 x i64], [1 x i64]}, {i8*, i8*, i64, i64, i64*, [1 x i64], [1 x i64]}* %"$350binary_subscr.172"`

I have made an example:

import numpy as np

```
import numba
from numba import jit
@jit(nopython=True,nogil=True)
def t_corrido_i():
grafo_e=np.array([[0,1,12],[0,2,12],[0,3,12]],dtype=np.int32)
tarefas_pj=np.array([ 0, 9, 13, 15, 16])
requere_nodes=grafo_e[np.where(grafo_e[:,1]==3)][:,0]
# Alternative for np.isin for numba
requere_no_outro_proc=np.array([x in set(requere_nodes) for x in tarefas_pj])
ix_nos_requeridos=np.int32(np.where(requere_no_outro_proc)[0])
t_corrido_i()
```

Does anyone have a clue of what could that be?