fix(response caching): nullable fields in entities

[aaronArinder]

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[apollo-librarian]

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File Changes

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* graphos/routing/(latest)/performance/caching/response-caching/faq.mdx
* graphos/routing/(latest)/performance/caching/response-caching/quickstart.mdx

Build ID: 2a490a0c3fb4331058a93082
Build Logs: View logs

URL: https://www.apollographql.com/docs/deploy-preview/2a490a0c3fb4331058a93082

[bnjjj]

I think it would be good to have a test for a @cacheTag to confirm it will set null

[bnjjj]

I also think we will need to change the composition validators

router/apollo-federation/src/schema/validators/cache_tag.rs

Line 193 in 642b1d3

if !is_fully_non_null(field) {

to allow @cacheTag to use a nullable argument