Support nullable types in graphene

Is your feature request related to a problem? Please describe. Do we have null type in graphene? The example, the default value of mode is null is not pass null value,

mutation{ insertModel(input:{ modelName: "model1" }) but some cases we need to pass null, the return error is "Syntax Error GraphQL (4:63) Unexpected Name "null" mutation{ insertModel(input:{ modelName: "model1" mode: null })

Describe the solution you’d like GraphQL supports null values, can graphene also support that? https://github.com/graphql/graphql-spec/pull/83

Describe alternatives you’ve considered A clear and concise description of any alternative solutions or features you’ve considered.

Additional context Add any other context or screenshots about the feature request here.

[jkimbo]

@wodCZ you’re correct that in Graphene v2 that is the way to get it to work. However in Graphene v3, because it’s using graphql-core v3, you can use null in the query directly: https://replit.com/@jkimbo/Graphene-v3#main.py

[alex-grover]

it is possible that the issue is the missing comma in the input? {modelName: "model1" mode: null}