ref: 966c65065c439fbc725650df96603086f346530d
parent: 79dc9adb6a541b1929227ded5d53730686fbc3d6
author: Paul Brossier <piem@piem.org>
date: Sun Dec 23 00:46:47 EST 2018
[py] take a copy for the last source block when iterating Appears to be the simplest solution to prevent resizing internal objects. See also 8e76c71.