I went back and forth on this.  Mostly it is legibility even though it eats up precious vertical space.  I actually think that just declaring simple variables is OK.  Where it starts to be illegible are cases like this:

```cython
cdef char * s, * t, * u, * v
cdef double x=42, y=x+1, z=x*y 
```

If you can think of a way to consistently disclude these but include the simple `cdef int i, j, k`, maybe that should go in.