Creates a sf object from numeric extent vector and applies a default WGS84 (EPSG:4326) coordinate reference system.
| 1 2 | spat_bb(b_ext, buff_dist = 0,
  proj4s = "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs")
 | 
| b_ext | Numeric extent [xmin, xmax, ymin, ymax] | 
| buff_dist | Distance in decimal degrees to expand the bounding box by in all directions. | 
| proj4s | Either the proj4 string or EPSG number of the native projection of the bounds | 
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