[developer] What vdev is picked as leading in mirror resilver proces?

[openzfs via openzfs-developer]

I have a 
question regarding ZFS mirror resilvering. Consider a mirror with two vdevs: 
disk A
 and B. Disk B is hot-removed. Data is written to mirror (only written 
to disk A). The host is powered off. Disk B is cold-attached to the host
 and booted again. Zpool is imported. What vdev of the mirror is 
leading in the resilver process? i.e. what data will prevail? Is this 
deterministic? ZFS version: zfs-0.8.3 (Ubuntu 20.04).
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