Spring Missing @Nullable on JsonPathAssertions.isEqualTo

Hello.

Unless I am very confused, the parameter expectedValue of JsonPathAssertions.isEqualTo should be Nullable, but it is not. If it is not supposed to be, then a isNull assertion would be helpful.

Full story on reddit https://www.reddit.com/r/Kotlin/comments/1nbnmrh/tell_kotlin_a_java_library_does_accept_null_values/ , when what I first thought was a problem with Kotlin turned out to be a missing Nullable in spring-test-6.2.10. To sum it up :

`webTestClient.get()

// ...

.jsonPath("$.phone_number").isEqualTo(testUserData.account.phoneNumber)`

in a kotlin project will prompt Intellij to send the warning "Java type mismatch: inferred type is 'String?', but 'Any' was expected." because phoneNumber can be null. The helpfull people on Reddit helped me figure it out : Kotlin thinks isEqualTo cannot accept null because the package is annotated with NonNullApi, but isEqualTo is not annotated with Nullable, even though opening isEqualTo show null is handled.

Comment From: sdeleuze

Good catch, I will refine.