`single_bracket_select` fails for `polygons` with large selection set

[adamlilith]

Need to select iteratively until all i are selected.

[adamlilith]

This issue seems not to occur if 1) valid vector is created in fasterRaster, then saved using writeVector(), reloaded using fast(), then selection applied using [.

Hacky workaround: Load vector then save/re-load using fast(). Undesirable.

Could not replicate bug using low-res version of North America (sans Alaska) from GADM.