diff --git a/konva.js b/konva.js
index 0709fa6d..3de57479 100644
--- a/konva.js
+++ b/konva.js
@@ -731,7 +731,9 @@
       },
       _sign: function (number) {
           if (number === 0) {
-              return 0;
+              // that is not what sign usually returns
+              // but that is what we need
+              return 1;
           }
           if (number > 0) {
               return 1;
@@ -3504,6 +3506,21 @@
               y: this.y(),
           };
       };
+      /**
+       * get absolute position of a node. That function can be used to calculate absolute position, but relative to any ancestor
+       * @method
+       * @name Konva.Node#getAbsolutePosition
+       * @param {Object} Ancestor optional ancestor node
+       * @returns {Konva.Node}
+       * @example
+       *
+       * // returns absolute position relative to top-left corner of canvas
+       * node.getAbsolutePosition();
+       *
+       * // calculate absolute position of node, inside stage
+       * // so stage transforms are ignored
+       * node.getAbsolutePosition(stage)
+       */
       Node.prototype.getAbsolutePosition = function (top) {
           var haveCachedParent = false;
           var parent = this.parent;
diff --git a/src/Node.ts b/src/Node.ts
index 75394adf..5e2256f0 100644
--- a/src/Node.ts
+++ b/src/Node.ts
@@ -1183,6 +1183,21 @@ export abstract class Node<Config extends NodeConfig = NodeConfig> {
       y: this.y(),
     };
   }
+  /**
+   * get absolute position of a node. That function can be used to calculate absolute position, but relative to any ancestor
+   * @method
+   * @name Konva.Node#getAbsolutePosition
+   * @param {Object} Ancestor optional ancestor node
+   * @returns {Konva.Node}
+   * @example
+   *
+   * // returns absolute position relative to top-left corner of canvas
+   * node.getAbsolutePosition();
+   *
+   * // calculate absolute position of node, inside stage
+   * // so stage transforms are ignored
+   * node.getAbsolutePosition(stage)
+   */
   getAbsolutePosition(top?) {
     let haveCachedParent = false;
     let parent = this.parent;
diff --git a/src/Util.ts b/src/Util.ts
index 5524dab0..6a5cba62 100644
--- a/src/Util.ts
+++ b/src/Util.ts
@@ -599,7 +599,9 @@ export const Util = {
   },
   _sign(number: number) {
     if (number === 0) {
-      return 0;
+      // that is not what sign usually returns
+      // but that is what we need
+      return 1;
     }
     if (number > 0) {
       return 1;
diff --git a/src/shapes/Text.ts b/src/shapes/Text.ts
index 6e51bcd4..a9d2c267 100644
--- a/src/shapes/Text.ts
+++ b/src/shapes/Text.ts
@@ -31,6 +31,7 @@ export interface TextConfig extends ShapeConfig {
   verticalAlign?: string;
   padding?: number;
   lineHeight?: number;
+  letterSpacing?: number;
   wrap?: string;
   ellipsis?: boolean;
 }
diff --git a/src/shapes/Transformer.ts b/src/shapes/Transformer.ts
index fef44c77..5252e069 100644
--- a/src/shapes/Transformer.ts
+++ b/src/shapes/Transformer.ts
@@ -29,6 +29,7 @@ export interface TransformerConfig extends ContainerConfig {
   anchorStroke?: string;
   anchorStrokeWidth?: number;
   anchorSize?: number;
+  anchorCornerRadius?: number;
   keepRatio?: boolean;
   centeredScaling?: boolean;
   enabledAnchors?: Array<string>;
diff --git a/test/unit/shapes/Transformer-test.js b/test/unit/shapes/Transformer-test.js
index e2d89e3f..e3084a31 100644
--- a/test/unit/shapes/Transformer-test.js
+++ b/test/unit/shapes/Transformer-test.js
@@ -4496,4 +4496,42 @@ suite('Transformer', function () {
     layer.add(tr);
     layer.draw();
   });
+
+  // we don't support height = 0
+  test.skip('try to tranform zero size shape', function () {
+    var stage = addStage();
+    var layer = new Konva.Layer();
+    stage.add(layer);
+
+    var shape = new Konva.Line({
+      x: stage.getWidth() / 4,
+      y: stage.getHeight() / 4,
+      points: [0, 0, 200, 0],
+      fill: 'black',
+      stroke: 'black',
+      strokeWidth: 4,
+      draggable: true,
+    });
+    layer.add(shape);
+
+    var tr = new Konva.Transformer({
+      nodes: [shape],
+      enabledAnchors: ['middle-left', 'middle-right'],
+      ignoreStroke: true,
+    });
+    layer.add(tr);
+
+    layer.draw();
+
+    tr.simulateMouseDown({
+      x: stage.width() / 2,
+      y: stage.height() / 2,
+    });
+    tr.simulateMouseDown({
+      x: stage.width() / 2 + 100,
+      y: stage.height() / 2,
+    });
+    tr.simulateMouseUp();
+    assert.equal(shape.scaleX(), 0.5);
+  });
 });