geojson serializer incorrectly displays integer64

[timeddilation]

Describe the bug
Given an integer64 property on an sf object
When plumber serializes the sf object as a geojson
Then the integer64 is returned as infinitesimally small value

To Reproduce
In my particular use case, I'm using geometry objects from tigris, so here is a trimmed example of the problem.
Create a plumber.R file. Paste the following code in it, run the API, and execute the endpoint:

library(plumber)
library(data.table)
library(bit64)
library(sf)
library(sp)
library(tigris)
library(geojsonsf)

options(tigris_use_cache = TRUE)

#* @apiTitle Geojson Bug Reprex

#* Get a geojson of all county subdivisions in Monroe County, PA
#* @get /pa_monroe_cousubs
#* @serializer geojson
function(){
  cousubs <- county_subdivisions(state = "42", county = "089") |>
    as.data.table()

  cousubs_dt <-
    cousubs[order(GEOID), .(
      id = as.integer64(GEOID),
      GEOID,
      NAME
    )]

  row.names(cousubs_dt) <- gsub("^", "ID", row.names(cousubs_dt))

  cousubs_sf <-
    cousubs[order(GEOID), geometry] |>
    as_Spatial() |>
    SpatialPolygonsDataFrame(data = cousubs_dt) |>
    st_as_sf()

  return(cousubs_sf)
}

Expected behavior
Returns the id as an integer. Expected result is:

"features": [
    {
      "type": "Feature",
      "properties": {
        "id": 4208904320,
        "GEOID": "4208904320",
        "NAME": "Barrett"
      } ...

Instead we get:

"features": [
    {
      "type": "Feature",
      "properties": {
        "id": 2.079475031e-314,
        "GEOID": "4208904320",
        "NAME": "Barrett"
      } ...

CLI:
Reproduced in both:

• OS: Ubuntu 20.04 AND Windows 10
• R versions 4.2.1 AND 4.1.2
• Plumber version 1.2.1

[blinktag]

@timeddilation I think you want to submit to this repo instead https://github.com/rstudio/plumber

[timeddilation]

bahaha, sorry about that...