diff --git a/src/arc_path.scad b/src/arc_path.scad
index d94b8aa3..ab4fedb5 100644
--- a/src/arc_path.scad
+++ b/src/arc_path.scad
@@ -9,7 +9,7 @@
 **/ 
 
 include <__private__/__frags.scad>;
-include <__private__/__is_vector.scad>;
+include <__private__/__is_float.scad>;
 include <__private__/__ra_to_xy.scad>;
 include <__private__/__edge_r.scad>;
 
@@ -17,7 +17,7 @@ function arc_path(radius, angle) =
     let(
         frags = __frags(radius),
         a_step = 360 / frags,
-        angles = __is_vector(angle) ? angle : [0, angle],
+        angles = __is_float(angle) ? [0, angle] : angle,
         m = floor(angles[0] / a_step) + 1,
         n = floor(angles[1] / a_step),
         points = concat([__ra_to_xy(__edge_r_begin(radius, angles[0], a_step, m), angles[0])],
diff --git a/src/cross_sections.scad b/src/cross_sections.scad
index ae6979cf..1eeb1563 100644
--- a/src/cross_sections.scad
+++ b/src/cross_sections.scad
@@ -9,16 +9,17 @@
 **/
 
 include <__private__/__to3d.scad>;
-include <__private__/__is_vector.scad>;
+include <__private__/__is_float.scad>;
 
 function cross_sections(shape_pts, path_pts, angles, twist = 0, scale = 1.0) =
     let(
         len_path_pts_minus_one = len(path_pts) - 1,
         sh_pts = len(shape_pts[0]) == 3 ? shape_pts : [for(p = shape_pts) __to3d(p)],
         pth_pts = len(path_pts[0]) == 3 ? path_pts : [for(p = path_pts) __to3d(p)],
-        scale_step_vt = __is_vector(scale) ? 
-            [(scale[0] - 1) / len_path_pts_minus_one, (scale[1] - 1) / len_path_pts_minus_one] :
-            [(scale - 1) / len_path_pts_minus_one, (scale - 1) / len_path_pts_minus_one],
+        scale_step_vt = __is_float(scale) ? 
+            [(scale - 1) / len_path_pts_minus_one, (scale - 1) / len_path_pts_minus_one] :
+            [(scale[0] - 1) / len_path_pts_minus_one, (scale[1] - 1) / len_path_pts_minus_one]
+            ,
         scale_step_x = scale_step_vt[0],
         scale_step_y = scale_step_vt[1],
         twist_step = twist / len_path_pts_minus_one
diff --git a/src/crystal_ball.scad b/src/crystal_ball.scad
index b684db53..696cd12e 100644
--- a/src/crystal_ball.scad
+++ b/src/crystal_ball.scad
@@ -9,10 +9,10 @@
 **/ 
 
 include <__private__/__nearest_multiple_of_4.scad>;
-include <__private__/__is_vector.scad>;
+include <__private__/__is_float.scad>;
 
 module crystal_ball(radius, theta = 360, phi = 180) {
-    phis = __is_vector(phi) ? phi : [0, phi];
+    phis = __is_float(phi) ? [0, phi] : phi;
     
     frags = __frags(radius);
 
diff --git a/src/helix.scad b/src/helix.scad
index 142779b2..a51a3319 100644
--- a/src/helix.scad
+++ b/src/helix.scad
@@ -8,14 +8,14 @@
 *
 **/ 
 
-include <__private__/__is_vector.scad>;
+include <__private__/__is_float.scad>;
 include <__private__/__frags.scad>;
 
 function helix(radius, levels, level_dist, vt_dir = "SPI_DOWN", rt_dir = "CT_CLK") = 
     let(
-        is_vt = __is_vector(radius),
-        r1 = is_vt ? radius[0] : radius,
-        r2 = is_vt ? radius[1] : radius,
+        is_flt = __is_float(radius),
+        r1 = is_flt ? radius : radius[0],
+        r2 = is_flt ? radius : radius[1],
         init_r = vt_dir == "SPI_DOWN" ? r2 : r1,
         _frags = __frags(init_r),
         h = level_dist * levels,
diff --git a/src/helix_extrude.scad b/src/helix_extrude.scad
index 47d3801c..1417e135 100644
--- a/src/helix_extrude.scad
+++ b/src/helix_extrude.scad
@@ -8,7 +8,7 @@
 *
 **/
 
-include <__private__/__is_vector.scad>;
+include <__private__/__is_float.scad>;
 include <__private__/__frags.scad>;
 
 module helix_extrude(shape_pts, radius, levels, level_dist, 
@@ -22,9 +22,9 @@ module helix_extrude(shape_pts, radius, levels, level_dist,
                 vt[leng - 1 - i]
         ];                         
                          
-    is_vt = __is_vector(radius);
-    r1 = is_vt ? radius[0] : radius;
-    r2 = is_vt ? radius[1] : radius;
+    is_flt = __is_float(radius);
+    r1 = is_flt ? radius : radius[0];
+    r2 = is_flt ? radius : radius[1];
     
     init_r = vt_dir == "SPI_DOWN" ? r2 : r1;
 
diff --git a/src/path_extrude.scad b/src/path_extrude.scad
index ad04bbc0..08ad23e5 100644
--- a/src/path_extrude.scad
+++ b/src/path_extrude.scad
@@ -8,7 +8,7 @@
 *
 **/
 
-include <__private__/__is_vector.scad>;
+include <__private__/__is_float.scad>;
 include <__private__/__to3d.scad>;
 include <__private__/__angy_angz.scad>;
 
@@ -39,12 +39,13 @@ module path_extrude(shape_pts, path_pts, triangles = "SOLID", twist = 0, scale =
         let(s =  (scale - 1) / len_path_pts_minus_one)
         [s, s, s];  
 
-    scale_step_vt = __is_vector(scale) ? 
+    scale_step_vt = __is_float(scale) ? 
+        scale_step() : 
         [
             (scale[0] - 1) / len_path_pts_minus_one, 
             (scale[1] - 1) / len_path_pts_minus_one,
             scale[2] == undef ? 0 : (scale[2] - 1) / len_path_pts_minus_one
-        ] : scale_step();   
+        ];   
 
     // get rotation matrice for sections
 
diff --git a/src/pie.scad b/src/pie.scad
index aff07e20..c8f735ae 100644
--- a/src/pie.scad
+++ b/src/pie.scad
@@ -9,7 +9,7 @@
 **/
 
 include <__private__/__frags.scad>;
-include <__private__/__is_vector.scad>;
+include <__private__/__is_float.scad>;
 include <__private__/__ra_to_xy.scad>;
 include <__private__/__shape_pie.scad>;
  
diff --git a/src/ring_extrude.scad b/src/ring_extrude.scad
index 3a3bb9d0..9d92ab66 100644
--- a/src/ring_extrude.scad
+++ b/src/ring_extrude.scad
@@ -19,7 +19,7 @@ module ring_extrude(shape_pts, radius, angle = 360, twist = 0, scale = 1.0, tria
     } else {
         a_step = 360 / __frags(radius);
 
-        angles = __is_vector(angle) ? angle : [0, angle];
+        angles = __is_float(angle) ? [0, angle] : angle;
 
         m = floor(angles[0] / a_step) + 1;
         n = floor(angles[1] / a_step);
diff --git a/src/rounded_cube.scad b/src/rounded_cube.scad
index 18b3955a..2c80bb74 100644
--- a/src/rounded_cube.scad
+++ b/src/rounded_cube.scad
@@ -8,15 +8,15 @@
 *
 **/
 
-include <__private__/__is_vector.scad>;
+include <__private__/__is_float.scad>;
 include <__private__/__frags.scad>;
 include <__private__/__nearest_multiple_of_4.scad>;
 
 module rounded_cube(size, corner_r, center = false) {
-    is_vt = __is_vector(size);
-    x = is_vt ? size[0] : size;
-    y = is_vt ? size[1] : size;
-    z = is_vt ? size[2] : size;
+    is_flt = __is_float(size);
+    x = is_flt ? size : size[0];
+    y = is_flt ? size : size[1];
+    z = is_flt ? size : size[2];
 
     corner_frags = __nearest_multiple_of_4(__frags(corner_r));
     edge_d = corner_r * cos(180 / corner_frags);
diff --git a/src/rounded_cylinder.scad b/src/rounded_cylinder.scad
index e0def46a..124d0dd7 100644
--- a/src/rounded_cylinder.scad
+++ b/src/rounded_cylinder.scad
@@ -8,7 +8,7 @@
 *
 **/
 
-include <__private__/__is_vector.scad>;
+include <__private__/__is_float.scad>;
 include <__private__/__frags.scad>;
 include <__private__/__pie_for_rounding.scad>;
 include <__private__/__half_trapezium.scad>;
diff --git a/src/rounded_extrude.scad b/src/rounded_extrude.scad
index 3e8468f6..badf6af9 100644
--- a/src/rounded_extrude.scad
+++ b/src/rounded_extrude.scad
@@ -9,13 +9,13 @@
 **/
 
 include <__private__/__frags.scad>;
-include <__private__/__is_vector.scad>;
+include <__private__/__is_float.scad>;
 
 module rounded_extrude(size, round_r, angle = 90, twist = 0, convexity = 10) {
 
-    is_vt = __is_vector(size);
-    x = is_vt ? size[0] : size;
-    y = is_vt ? size[1] : size;
+    is_flt = __is_float(size);
+    x = is_flt ? size : size[0];
+    y = is_flt ? size : size[1];
     
     q_corner_frags = __frags(round_r) / 4;
     
diff --git a/src/rounded_square.scad b/src/rounded_square.scad
index 38fd4c4d..3c8a1399 100644
--- a/src/rounded_square.scad
+++ b/src/rounded_square.scad
@@ -8,16 +8,16 @@
 *
 **/
 
-include <__private__/__is_vector.scad>;
+include <__private__/__is_float.scad>;
 include <__private__/__frags.scad>;
 include <__private__/__pie_for_rounding.scad>;
 include <__private__/__half_trapezium.scad>;
 include <__private__/__trapezium.scad>;
 
 module rounded_square(size, corner_r, center = false) {
-    is_vt = __is_vector(size);
-    x = is_vt ? size[0] : size;
-    y = is_vt ? size[1] : size;       
+    is_flt = __is_float(size);
+    x = is_flt ? size : size[0];
+    y = is_flt ? size : size[1];       
     
     position = center ? [0, 0] : [x / 2, y / 2];
     points = __trapezium(