wkt_to_geojson can not convert 3D wkt like 'POLYGON Z' to geojson

[HWTsang]

wkt_to_geojson is wrong with 'POLYGON Z ((30 10, 40 40, 20 40, 10 20, 30 10))'

[MTKnife]

Your example uses 2D coordinates, so it really should throw an error there--but it doesn't work with 3D coordinates, either (e.g. "POINT Z (0 0 12)"). For the record, it also won't handle "M" (or "ZM").