why doesn't graphql.js return `OctokitResponse`?

[scarf005]

related: #329

unlike octokit's REST endpoint, octokit's graphql API returns only the data field. i'm curious why graphql endpoint doesn't return OctokitResponse by itself? this makes examining headers complicated.

graphql.js/src/graphql.ts

Line 89 in e4a3c30

return response.data.data;

[octokit]

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