chore: Add warning when range isn't a multiple of the step (#142)

src/Slider.jsx

@@ -5,6 +5,7 @@ import Track from './Track';
 import DefaultHandle from './Handle';
 import Steps from './Steps';
 import Marks from './Marks';
+import warning from 'warning';
 
 function noop() {
 }
@@ -30,7 +31,7 @@ class Slider extends React.Component {
   constructor(props) {
     super(props);
 
-    const { range, min, max } = props;
+    const { range, min, max, step } = props;
     const initialValue = range ? Array.apply(null, Array(range + 1)).map(() => min) : min;
     const defaultValue = ('defaultValue' in props ? props.defaultValue : initialValue);
     const value = (props.value !== undefined ? props.value : defaultValue);
@@ -44,6 +45,15 @@ class Slider extends React.Component {
       recent = bounds.length - 1;
     }
 
+    if (process.env.NODE_ENV !== 'production' && (max - min) % step !== 0) {
+      warning(
+        false,
+        'Slider[max] - Slider[min] (%s) should be a multiple of Slider[step] (%s)',
+        max - min,
+        step
+      );
+    }
+
     this.state = {
       handle: null,
       recent,