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FastQL returns ExecutionResult(data, errors, extensions, executed). Use result.formatted() to obtain the GraphQL response dictionary. Syntax, operation selection, validation, and variable coercion errors set executed=False and omit data from the formatted result. Resolver and completion errors happen during execution, include a response path, and preserve data from unaffected branches. When a non-null field produces null, the null propagates to the nearest nullable parent as required by GraphQL semantics. 
result = await execute(schema, query, variable_values={"id": "missing"})

if result.errors:
    for error in result.errors:
        logger.warning(error.message, extra={"path": error.path})
Model nullability deliberately. Use T | None where absence is part of the API; use non-null output types when failure should invalidate the containing branch.