Commits on Sep 17, 2024

1. Preserve defaultValue literals …

   Fixes graphql#3051
   
   This change solves the problem of default values defined via SDL not always resolving correctly through introspection by preserving the original GraphQL literal in the schema definition. This changes argument and input field definitions `defaultValue` field from just the "value" to a new `GraphQLDefaultValueUsage` type which contains either -- but not both -- "value" and "literal" fields.
   
   Here is the flow for how a default value defined in an SDL would be converted into a functional schema and back to an SDL:
   
   **Before this change:**
   
   ```
   (SDL) --parse-> (AST) --coerceInputLiteral--> (defaultValue config) --valueToAST--> (AST) --print --> (SDL)
   ```
   
   `coerceInputLiteral` performs coercion which is a one-way function, and `valueToAST` is unsafe and set to be deprecated in graphql#3049.
   
   **After this change:**
   
   ```
   (SDL) --parse-> (defaultValue literal config) --print --> (SDL)
   ```

   

   leebyron authored and yaacovCR committed Sep 17, 2024
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