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third_party/polymer/components/iron-range-behavior/iron-range-behavior.html

Index: third_party/polymer/components/iron-range-behavior/iron-range-behavior.html
diff --git a/third_party/polymer/components/iron-range-behavior/iron-range-behavior.html b/third_party/polymer/components/iron-range-behavior/iron-range-behavior.html
index 28469e9eaeb15a06e3e363d8c27e415b14de9648..96f3c15b02a7520897a7ab212830d9cd6dcc5b1c 100644
--- a/third_party/polymer/components/iron-range-behavior/iron-range-behavior.html
+++ b/third_party/polymer/components/iron-range-behavior/iron-range-behavior.html
@@ -83,18 +83,27 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
   },
 
   _calcStep: function(value) {
-   /**
-    * if we calculate the step using
-    * `Math.round(value / step) * step` we may hit a precision point issue
-    * eg. 0.1 * 0.2 =  0.020000000000000004
-    * http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html
-    *
-    * as a work around we can divide by the reciprocal of `step`
-    */
     // polymer/issues/2493
     value = parseFloat(value);
-    return this.step ? (Math.round((value + this.min) / this.step) -
-        (this.min / this.step)) / (1 / this.step) : value;
+
+    if (!this.step) {
+      return value;
+    }
+
+    var numSteps = Math.round((value - this.min) / this.step);
+    if (this.step < 1) {
+     /**
+      * For small values of this.step, if we calculate the step using
+      * `Math.round(value / step) * step` we may hit a precision point issue
+      * eg. 0.1 * 0.2 =  0.020000000000000004
+      * http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html
+      *
+      * as a work around we can divide by the reciprocal of `step`
+      */
+      return numSteps / (1 / this.step) + this.min;
+    } else {
+      return numSteps * this.step + this.min;
+    }
   },
 
   _validateValue: function() {