BiptJXu opened a new issue #13348:
URL: https://github.com/apache/incubator-echarts/issues/13348
### Version
latest
### Steps to reproduce
First, you need to define an array with repeated data, which is correct when
drawn. However, if you modify the data "my_data[0]=140", you will find that the
last data is also refreshed
once.(CH:首先，你需要定义含有重复数据的数组，这时画出来时正确的。但是，如果你修改其中的数据“my_data[0]=140”,你会发现最后一个数据也刷新了一次)
```javascript
var my_data=[130, 200, 150, 80, 70, 110, 130];
my_data[0]=135; //test code（is a example）
option = {
xAxis: {
type: 'category',
data: my_data
},
yAxis: {
type: 'value'
},
series: [{
data: my_data,
type: 'bar'
}]
};
```
This problem seems to have nothing to do with the version. Today, I also
encountered this problem in the Example on the official
website.(https://echarts.apache.org/examples/en/editor.html?c=bar-simple)
### What is expected?
When the histogram(bar) has two duplicate data, modifying one will refresh
the other at the same time, although I only want to show the change of one
data.(CH:当柱状图有两个重复数据时，修改其中一个会同时刷新另外一个，虽然我只想展示一个数据的变化)
### What is actually happening?
When modifying the first data, I found that the last data will also change,
even though I only modified the first one in the array (when the first element
is the same as the last one).
CH:修改第一个数据时，发现最后一个数据也会变化，尽管我在数组中只修改了第一个（当第一个元素和最后一个相同时）。
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