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#' @param method A string, either `"shapes"` (the default) or `"euclidean"`.
#' `"shapes"` measures lengths along the trip's shape, described in the
#' `shapes` table, while `"euclidean"` measures the straight-line
#' (great-circle) distances between consecutive stops. If the GTFS object
#' doesn't have a `shapes` table, or if its `trips` table doesn't have a
#' `shape_id` column, `"euclidean"` is used instead, with a warning.
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