May I ask why the barBorderRadius in the bar chart of echarts increases to a certain value and then changes the basic failure? What's the principle?

option = {

xAxis: {
    type: "category",
    data: ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]
},
yAxis: {
    type: "value"
},
series: [{
    data: [120, 200, 150, 80, 70, 110, 130],
    type: "bar",
    itemStyle:{  
        barBorderRadius:100
    }
   
}]

};
barBorderRadius is used to set the fillet radius. What is the range of this value? Why is it ineffective to continue to increase after increasing to a certain extent?

Feb.28,2021

has been resolved: the maximum fillet diameter of the column chart is equal to the maximum width of the rectangle, so when the fillet radius parameter is set to more than half of the width of the column chart, it has no effect to continue to increase the fillet radius.

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