Lazy open: parses the header and tile index but does not decode any
tiles. Returns a list with metadata and an external pointer handle.
The pointer is auto-finalized when garbage collected; call
vec_close_raster() to release earlier.
Lazy open: parses the header and tile index but does not decode any
tiles. Returns a list with metadata and an external pointer handle.
The pointer is auto-finalized when garbage collected; call
vec_close_raster() to release earlier.