diff --git a/geojson/feature.go b/geojson/feature.go
index bd7a5576..a74f80ce 100644
--- a/geojson/feature.go
+++ b/geojson/feature.go
@@ -15,32 +15,32 @@ type Feature struct {
 	idprops  string // raw id and properties seperated by a '\0'
 }
 
-func fillFeatureMap(json string) (Feature, []byte, error) {
+func fillFeatureMap(json string) (Feature, error) {
 	var g Feature
 	v := gjson.Get(json, "geometry")
 	switch v.Type {
 	default:
-		return g, nil, errInvalidGeometryMember
+		return g, errInvalidGeometryMember
 	case gjson.Null:
-		return g, nil, errGeometryMemberRequired
+		return g, errGeometryMemberRequired
 	case gjson.JSON:
 		var err error
 		g.Geometry, err = objectMap(v.Raw, feat)
 		if err != nil {
-			return g, nil, err
+			return g, err
 		}
 	}
 	var err error
 	g.BBox, err = fillBBox(json)
 	if err != nil {
-		return g, nil, err
+		return g, err
 	}
 
 	var propsExists bool
 	props := gjson.Get(json, "properties")
 	switch props.Type {
 	default:
-		return g, nil, errInvalidPropertiesMember
+		return g, errInvalidPropertiesMember
 	case gjson.Null:
 	case gjson.JSON:
 		propsExists = true
@@ -49,7 +49,7 @@ func fillFeatureMap(json string) (Feature, []byte, error) {
 	if id.Exists() || propsExists {
 		g.idprops = makeCompositeRaw(id.Raw, props.Raw)
 	}
-	return g, nil, err
+	return g, err
 }
 
 // Geohash converts the object to a geohash value.
diff --git a/geojson/featurecollection.go b/geojson/featurecollection.go
index 51300a19..b46150b1 100644
--- a/geojson/featurecollection.go
+++ b/geojson/featurecollection.go
@@ -13,34 +13,34 @@ type FeatureCollection struct {
 	BBox     *BBox
 }
 
-func fillFeatureCollectionMap(json string) (FeatureCollection, []byte, error) {
+func fillFeatureCollectionMap(json string) (FeatureCollection, error) {
 	var g FeatureCollection
 	res := gjson.Get(json, "features")
 	switch res.Type {
 	default:
-		return g, nil, errInvalidFeaturesMember
+		return g, errInvalidFeaturesMember
 	case gjson.Null:
-		return g, nil, errFeaturesMemberRequired
+		return g, errFeaturesMemberRequired
 	case gjson.JSON:
 		if !resIsArray(res) {
-			return g, nil, errInvalidFeaturesMember
+			return g, errInvalidFeaturesMember
 		}
 		v := res.Array()
 		g.Features = make([]Object, len(v))
 		for i, res := range v {
 			if res.Type != gjson.JSON {
-				return g, nil, errInvalidFeature
+				return g, errInvalidFeature
 			}
 			o, err := objectMap(res.Raw, fcoll)
 			if err != nil {
-				return g, nil, err
+				return g, err
 			}
 			g.Features[i] = o
 		}
 	}
 	var err error
 	g.BBox, err = fillBBox(json)
-	return g, nil, err
+	return g, err
 }
 
 // Geohash converts the object to a geohash value.
diff --git a/geojson/geometrycollection.go b/geojson/geometrycollection.go
index 9eeba4c0..f28e0b51 100644
--- a/geojson/geometrycollection.go
+++ b/geojson/geometrycollection.go
@@ -13,34 +13,34 @@ type GeometryCollection struct {
 	BBox       *BBox
 }
 
-func fillGeometryCollectionMap(json string) (GeometryCollection, []byte, error) {
+func fillGeometryCollectionMap(json string) (GeometryCollection, error) {
 	var g GeometryCollection
 	res := gjson.Get(json, "geometries")
 	switch res.Type {
 	default:
-		return g, nil, errInvalidGeometries
+		return g, errInvalidGeometries
 	case gjson.Null:
-		return g, nil, errGeometriesRequired
+		return g, errGeometriesRequired
 	case gjson.JSON:
 		if !resIsArray(res) {
-			return g, nil, errInvalidGeometries
+			return g, errInvalidGeometries
 		}
 		v := res.Array()
 		g.Geometries = make([]Object, len(v))
 		for i, res := range v {
 			if res.Type != gjson.JSON {
-				return g, nil, errInvalidGeometry
+				return g, errInvalidGeometry
 			}
 			o, err := objectMap(res.Raw, gcoll)
 			if err != nil {
-				return g, nil, err
+				return g, err
 			}
 			g.Geometries[i] = o
 		}
 	}
 	var err error
 	g.BBox, err = fillBBox(json)
-	return g, nil, err
+	return g, err
 }
 
 // CalculatedBBox is exterior bbox containing the object.
diff --git a/geojson/levels.go b/geojson/levels.go
index 8406fcae..d7d3503e 100644
--- a/geojson/levels.go
+++ b/geojson/levels.go
@@ -9,12 +9,12 @@ import (
 func resIsArray(res gjson.Result) bool {
 	if res.Type == gjson.JSON {
 		for i := 0; i < len(res.Raw); i++ {
-			if res.Raw[i] <= ' ' {
-				continue
-			}
 			if res.Raw[i] == '[' {
 				return true
 			}
+			if res.Raw[i] <= ' ' {
+				continue
+			}
 			break
 		}
 	}
@@ -26,7 +26,7 @@ func resIsArray(res gjson.Result) bool {
 ////////////////////////////////
 
 func fillLevel1Map(json string) (
-	coordinates Position, bbox *BBox, bytesOut []byte, err error,
+	coordinates Position, bbox *BBox, err error,
 ) {
 	coords := gjson.Get(json, "coordinates")
 	switch coords.Type {
@@ -96,7 +96,7 @@ func level1IsCoordZDefined(coordinates Position, bbox *BBox) bool {
 ////////////////////////////////
 
 func fillLevel2Map(json string) (
-	coordinates []Position, bbox *BBox, bytesOut []byte, err error,
+	coordinates []Position, bbox *BBox, err error,
 ) {
 	coords := gjson.Get(json, "coordinates")
 	switch coords.Type {
@@ -186,7 +186,7 @@ func level2IsCoordZDefined(coordinates []Position, bbox *BBox) bool {
 ////////////////////////////////
 
 func fillLevel3Map(json string) (
-	coordinates [][]Position, bbox *BBox, bytesOut []byte, err error,
+	coordinates [][]Position, bbox *BBox, err error,
 ) {
 	coords := gjson.Get(json, "coordinates")
 	switch coords.Type {
@@ -305,7 +305,7 @@ func level3IsCoordZDefined(coordinates [][]Position, bbox *BBox) bool {
 ////////////////////////////////
 
 func fillLevel4Map(json string) (
-	coordinates [][][]Position, bbox *BBox, bytesOut []byte, err error,
+	coordinates [][][]Position, bbox *BBox, err error,
 ) {
 	coords := gjson.Get(json, "coordinates")
 	switch coords.Type {
diff --git a/geojson/linestring.go b/geojson/linestring.go
index 792607b0..533a512c 100644
--- a/geojson/linestring.go
+++ b/geojson/linestring.go
@@ -8,7 +8,7 @@ type LineString struct {
 	BBox        *BBox
 }
 
-func fillLineString(coordinates []Position, bbox *BBox, b []byte, err error) (LineString, []byte, error) {
+func fillLineString(coordinates []Position, bbox *BBox, err error) (LineString, error) {
 	if err == nil {
 		if len(coordinates) < 2 {
 			err = errLineStringInvalidCoordinates
@@ -17,7 +17,7 @@ func fillLineString(coordinates []Position, bbox *BBox, b []byte, err error) (Li
 	return LineString{
 		Coordinates: coordinates,
 		BBox:        bbox,
-	}, b, err
+	}, err
 }
 
 // CalculatedBBox is exterior bbox containing the object.
diff --git a/geojson/multilinestring.go b/geojson/multilinestring.go
index c9545725..6c328793 100644
--- a/geojson/multilinestring.go
+++ b/geojson/multilinestring.go
@@ -11,7 +11,7 @@ type MultiLineString struct {
 	BBox        *BBox
 }
 
-func fillMultiLineString(coordinates [][]Position, bbox *BBox, b []byte, err error) (MultiLineString, []byte, error) {
+func fillMultiLineString(coordinates [][]Position, bbox *BBox, err error) (MultiLineString, error) {
 	if err == nil {
 		for _, coordinates := range coordinates {
 			if len(coordinates) < 2 {
@@ -23,7 +23,7 @@ func fillMultiLineString(coordinates [][]Position, bbox *BBox, b []byte, err err
 	return MultiLineString{
 		Coordinates: coordinates,
 		BBox:        bbox,
-	}, b, err
+	}, err
 }
 
 // CalculatedBBox is exterior bbox containing the object.
diff --git a/geojson/multipoint.go b/geojson/multipoint.go
index 972ab32b..87f66667 100644
--- a/geojson/multipoint.go
+++ b/geojson/multipoint.go
@@ -11,11 +11,11 @@ type MultiPoint struct {
 	BBox        *BBox
 }
 
-func fillMultiPoint(coordinates []Position, bbox *BBox, b []byte, err error) (MultiPoint, []byte, error) {
+func fillMultiPoint(coordinates []Position, bbox *BBox, err error) (MultiPoint, error) {
 	return MultiPoint{
 		Coordinates: coordinates,
 		BBox:        bbox,
-	}, b, err
+	}, err
 }
 
 // CalculatedBBox is exterior bbox containing the object.
diff --git a/geojson/multipolygon.go b/geojson/multipolygon.go
index aed83356..944570f5 100644
--- a/geojson/multipolygon.go
+++ b/geojson/multipolygon.go
@@ -8,7 +8,7 @@ type MultiPolygon struct {
 	BBox        *BBox
 }
 
-func fillMultiPolygon(coordinates [][][]Position, bbox *BBox, b []byte, err error) (MultiPolygon, []byte, error) {
+func fillMultiPolygon(coordinates [][][]Position, bbox *BBox, err error) (MultiPolygon, error) {
 	if err == nil {
 	outer:
 		for _, ps := range coordinates {
@@ -27,7 +27,7 @@ func fillMultiPolygon(coordinates [][][]Position, bbox *BBox, b []byte, err erro
 	return MultiPolygon{
 		Coordinates: coordinates,
 		BBox:        bbox,
-	}, b, err
+	}, err
 }
 
 // CalculatedBBox is exterior bbox containing the object.
diff --git a/geojson/object.go b/geojson/object.go
index 5414b100..3d2e425a 100644
--- a/geojson/object.go
+++ b/geojson/object.go
@@ -195,23 +195,23 @@ func objectMap(json string, from int) (Object, error) {
 	default:
 		return nil, fmt.Errorf(fmtErrTypeIsUnknown, typ)
 	case "Point":
-		o, _, err = fillSimplePointOrPoint(fillLevel1Map(json))
+		o, err = fillSimplePointOrPoint(fillLevel1Map(json))
 	case "MultiPoint":
-		o, _, err = fillMultiPoint(fillLevel2Map(json))
+		o, err = fillMultiPoint(fillLevel2Map(json))
 	case "LineString":
-		o, _, err = fillLineString(fillLevel2Map(json))
+		o, err = fillLineString(fillLevel2Map(json))
 	case "MultiLineString":
-		o, _, err = fillMultiLineString(fillLevel3Map(json))
+		o, err = fillMultiLineString(fillLevel3Map(json))
 	case "Polygon":
-		o, _, err = fillPolygon(fillLevel3Map(json))
+		o, err = fillPolygon(fillLevel3Map(json))
 	case "MultiPolygon":
-		o, _, err = fillMultiPolygon(fillLevel4Map(json))
+		o, err = fillMultiPolygon(fillLevel4Map(json))
 	case "GeometryCollection":
-		o, _, err = fillGeometryCollectionMap(json)
+		o, err = fillGeometryCollectionMap(json)
 	case "Feature":
-		o, _, err = fillFeatureMap(json)
+		o, err = fillFeatureMap(json)
 	case "FeatureCollection":
-		o, _, err = fillFeatureCollectionMap(json)
+		o, err = fillFeatureCollectionMap(json)
 	}
 	return o, err
 }
diff --git a/geojson/point.go b/geojson/point.go
index 91c494b1..5b37e01c 100644
--- a/geojson/point.go
+++ b/geojson/point.go
@@ -12,18 +12,18 @@ type Point struct {
 	BBox        *BBox
 }
 
-func fillSimplePointOrPoint(coordinates Position, bbox *BBox, b []byte, err error) (Object, []byte, error) {
+func fillSimplePointOrPoint(coordinates Position, bbox *BBox, err error) (Object, error) {
 	if coordinates.Z == 0 && bbox == nil {
-		return fillSimplePoint(coordinates, bbox, b, err)
+		return fillSimplePoint(coordinates, bbox, err)
 	}
-	return fillPoint(coordinates, bbox, b, err)
+	return fillPoint(coordinates, bbox, err)
 }
 
-func fillPoint(coordinates Position, bbox *BBox, b []byte, err error) (Point, []byte, error) {
+func fillPoint(coordinates Position, bbox *BBox, err error) (Point, error) {
 	return Point{
 		Coordinates: coordinates,
 		BBox:        bbox,
-	}, b, err
+	}, err
 }
 
 // CalculatedBBox is exterior bbox containing the object.
diff --git a/geojson/polygon.go b/geojson/polygon.go
index f52b1d7e..8fc3d2fb 100644
--- a/geojson/polygon.go
+++ b/geojson/polygon.go
@@ -13,7 +13,7 @@ type Polygon struct {
 	BBox        *BBox
 }
 
-func fillPolygon(coordinates [][]Position, bbox *BBox, b []byte, err error) (Polygon, []byte, error) {
+func fillPolygon(coordinates [][]Position, bbox *BBox, err error) (Polygon, error) {
 	if err == nil {
 		if len(coordinates) == 0 {
 			err = errMustBeALinearRing
@@ -30,7 +30,7 @@ func fillPolygon(coordinates [][]Position, bbox *BBox, b []byte, err error) (Pol
 	return Polygon{
 		Coordinates: coordinates,
 		BBox:        bbox,
-	}, b, err
+	}, err
 }
 
 // CalculatedBBox is exterior bbox containing the object.
diff --git a/geojson/simplepoint.go b/geojson/simplepoint.go
index 7c817cea..f39439ee 100644
--- a/geojson/simplepoint.go
+++ b/geojson/simplepoint.go
@@ -16,8 +16,8 @@ func New2DPoint(x, y float64) SimplePoint {
 	return SimplePoint{x, y}
 }
 
-func fillSimplePoint(coordinates Position, bbox *BBox, b []byte, err error) (SimplePoint, []byte, error) {
-	return SimplePoint{X: coordinates.X, Y: coordinates.Y}, b, err
+func fillSimplePoint(coordinates Position, bbox *BBox, err error) (SimplePoint, error) {
+	return SimplePoint{X: coordinates.X, Y: coordinates.Y}, err
 }
 
 // CalculatedBBox is exterior bbox containing the object.