Add support for interfaces, part 3: automatically add __typename #56
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Summary:
In #52, I added support for interface types, but with the simplifying
restriction (among others) that the user must request the field
__typename
. In this commit, I remove this restriction.The basic idea is simple: we preprocess the query to add
__typename
.The implementation isn't much more complicated! Although it required
some new wiring in a few places.
Issue: #8
Test plan:
make check