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P34: implementing field type is either exact match or of covariant type #974

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Merged
merged 2 commits into from
Jan 5, 2023
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P34: implementing field type is either exact match or of covariant type #974

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bc67f36
Fix: implementing field type is either exact match or covariant type
romanivantsov Jul 28, 2022
a6df980
Match language in IsValidImplimentation
leebyron Jan 5, 2023
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7 changes: 4 additions & 3 deletions spec/Section 4 -- Introspection.md
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Expand Up @@ -316,9 +316,10 @@ Fields\:
**Interface**

Interfaces are an abstract type where there are common fields declared. Any type
that implements an interface must define all the fields with names and types
exactly matching. The implementations of this interface are explicitly listed
out in `possibleTypes`.
that implements an interface must define all the named fields where each
implementing field type is equal to or a sub-type of (covariant) the interface
type. The implementations of this interface are explicitly listed out in
`possibleTypes`.

Fields\:

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