Fix error when merging lists in fragments #452
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We noticed some exceptions being thrown after upgrading from 0.38.0 to 1.0
It seemed that when there is a list field both on an object and in a fragment, lacinia was attempting to do a map merge on the lists.
I've added a test which simulates the problem we had, and modified internal-utils/deep-merge so that it works on maps, sequentials and any other values.