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    interface IExpressionFunction {
        apply: (evalContext: IEvalContext) => Promise<TermExpression>;
        checkArity: (args: Expression[]) => boolean;
    }

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    apply: (evalContext: IEvalContext) => Promise<TermExpression>
    checkArity: (args: Expression[]) => boolean

    The arity of the function will be checked when parsing and preparing a function. This allows us to check if the query is correct even before we process any bindings.