Integers are weird

I’m currently trying to teach Bohrium that a+1+1 is the same as a+2. This was an somewhat easy task.

What were really doing is merging chains of Bohrium byte-code, whenever possible, say in the following Python program:

import numpy as np
z = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])

z -= 5
z += 1
z += 1
z += 1
z += 1
z += 1

z = z + 2
z += 8

print z

Here we should be able to combine all the additions and subtractions and simply add 10 to z.

The same should be possible in the following:

import numpy as np
z = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])

z *= 5
z /= 1
z /= 2
z *= 2

print z

This should be just multiplying with 5, however Python gives the following result, when running the above:

[[ 4 10 14]
 [20 24 30]
 [34 40 44]]

This is of course because of the order of operations, even though they do not matter in this case, and the fact that my z array may only hold integers.

When the left-side can only hold integers, the following is unfortunately true: