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Description
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? graphql/graphql-spec#83
Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.
Additional context
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