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#' @param decay_function A `fuction` that converts travel cost into an
#' impedance factor used to weight opportunities. This function should take a
#' `numeric` vector and also return a `numeric` vector as output, with the
#' same length as the input. For convenience, the package currently includes
#' the following functions: [decay_binary()], [decay_exponential()],
#' [decay_power()] and [decay_stepped()]. See the documentation of each decay
#' function for more details.
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