fix: Protect against missing typename fields on base types #368
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Follow-up to #102
Resolves #365
Summary
The differentiation when going from a narrow to a wide type can still cause confusion when the
__typename
field isn't included on the concrete/base type i.e. on the fragment that includes the abstract interface type.This PR adds another optional
__typename
field to add disambiguation and avoid any confusion caused by this.Set of changes
__typename?: PossibleType
field