Converting latitude/longitude coordinates into a QuadKey
and then back to latitude/longitude won't yield identical values,
unless the initial latitude/longitude coordinates
correspond to the upper-left QuadKey's pixel and tile XY coordinates
at the same zoom level.
Understanding this distinction is crucial for
the accurate use of these functions in coordinate conversions.
For a detailed explanation on how to use this
and other similar quadkeyr functions,
read the the vignette:
https://docs.ropensci.org/quadkeyr/articles/quadkey_to_sf_conversion.html