Control: close -1 Upstream Linux kernel now made newinstances the default (and only) option starting with 4.7-rc2:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=eedf265aa003b4781de24cfed40a655a664457e6 Since bwh told me this will definitely be included in Stretch, there is no need to spend more time on this.
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