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export function _arity(n, fn){  switch (n){  case 0:    return function (){      return fn.apply(this, arguments)    }  case 1:    return function (_1){      return fn.apply(this, arguments)    }  case 2:    return function (_1, _2){      return fn.apply(this, arguments)    }  case 3:    return function (      _1, _2, _3    ){      return fn.apply(this, arguments)    }  case 4:    return function (      _1, _2, _3, _4    ){      return fn.apply(this, arguments)    }  case 5:    return function (      _1, _2, _3, _4, _5    ){      return fn.apply(this, arguments)    }  case 6:    return function (      _1, _2, _3, _4, _5, _6    ){      return fn.apply(this, arguments)    }  case 7:    return function (      _1, _2, _3, _4, _5, _6, _7    ){      return fn.apply(this, arguments)    }  case 8:    return function (      _1, _2, _3, _4, _5, _6, _7, _8    ){      return fn.apply(this, arguments)    }  case 9:    return function (      _1, _2, _3, _4, _5, _6, _7, _8, _9    ){      return fn.apply(this, arguments)    }  default:    return function (      _1, _2, _3, _4, _5, _6, _7, _8, _9, _10    ){      return fn.apply(this, arguments)    }  }}