pissang edited a comment on issue #11458: pieselectchange event handler default data.seriesId value has extra whitespace character URL: https://github.com/apache/incubator-echarts/issues/11458#issuecomment-545271042 Hi @zachsa It's a special character `\0` to avoid generated id conflicts with user-given id. We can also verify if the id is auto-generated by simply checking this character. The code is in https://github.com/apache/incubator-echarts/blob/master/src/util/model.js#L290 The downside of this solution is it may cause confusion if developers want to use this auto-generated id. We can have a further discussion about it under this issue @100pah
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