Might be a nitpick, but: wouldn't it be better if the user can "atomically swap" two fields when configuring import? As in, I can't swap the CSV column "Full Name" with "Email" without first setting "Email" to None, then setting "Full Name" to "Email", and then setting "Email" to "Full Name".
Might be a nitpick, but: wouldn't it be better if the user can "atomically swap" two fields when configuring import? As in, I can't swap the CSV column "Full Name" with "Email" without first setting "Email" to None, then setting "Full Name" to "Email", and then setting "Email" to "Full Name".