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AxInputFunctionType

type AxInputFunctionType = (
  | AxFunction
  | {
  toFunction: () => 
     | AxFunction
    | AxFunction[];
})[];

Defined in: https://github.com/ax-llm/ax/blob/d2df625e2c2fd70a090d6321c042579c2819f0d1/src/ax/dsp/functions.ts#L246