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FastQL maps ordinary Python annotations to built-in GraphQL scalars:
PythonGraphQL
intInt
floatFloat
strString
boolBoolean
ID is available as an explicit GraphQL scalar. NonNull(type_) and ListType(type_) are low-level wrappers used by the internal type model and advanced schema construction. In decorated Python definitions, prefer annotation syntax: 
required_name: str
optional_name: str | None
required_items: list[Item]
optional_items: list[Item] | None
Use custom scalars for domain values that require explicit parsing and serialization. Scalar implementations must return GraphQL-compatible serialized output and raise clear errors for invalid input.