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AxInputFunctionType

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

Defined in: https://github.com/ax-llm/ax/blob/9a5a7060a48f9eef46efc680b0cdf6b42bff5df2/src/ax/dsp/functions.ts#L180