Bullet angle after bounce off solid isn't round

Link to .capx file (required!):

docs.google.com/file/d/0B7p49JKt0CGLcXJ2c09UdkRjSGs/edit

Steps to reproduce:

1. Run project

2. You can add "round" condition in the second event to solve the problem

round(Ball.Bullet.AngleOfMotion)

Observed result:

After bouncing angle of movement is -90.00000000000003

(thanks to the new debugger, text plugin shows that it's -90.0)

Expected result:

After bouncing angle of movement is -90

Browsers affected:

Firefox: yes

Opera: yes

Operating system & service pack:

Vista sp2

Construct 2 version:

139 as well as 141

Closing as won't fix. This type of tiny inaccuracy is normal in computer games.

But any other event doesn't work without "round" condition if it's based on 90.0 degree movement after bouncing.

For example, a camera in my game depends on ball's angle of movement, and I've spent some time to find this problem.