GraphQL Allows Fields Starting with __ in the Mutation Type

[ThisaruGuruge]

Description:

If a GraphQL service has a field inside the Mutation type starting with double underscores (__), the compiler allows using the name. This should throw a compiler error.

Reproducible code:

import ballerina/graphql;

service on new graphql:Listener(9000) {
    resource function get greeting() returns string {
        return "Hello";
    }

    remote function __schema() returns string {
        return "Hello";
    }
}

[github-actions]

This issue is NOT closed with a proper Reason/ label. Make sure to add proper reason label before closing. Please add or leave a comment with the proper reason label now.

      - Reason/EngineeringMistake - The issue occurred due to a mistake made in the past.
      - Reason/Regression - The issue has introduced a regression.
      - Reason/MultipleComponentInteraction - Issue occured due to interactions in multiple components.
      - Reason/Complex - Issue occurred due to complex scenario.
      - Reason/Invalid - Issue is invalid.
      - Reason/Other - None of the above cases.