Ovilia opened a new pull request #15869:
URL: https://github.com/apache/echarts/pull/15869


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   ## Brief Information
   
   This pull request is in the type of:
   
   - [x] bug fixing
   - [ ] new feature
   - [ ] others
   
   
   
   ### What does this PR do?
   
   <!-- USE ONCE SENTENCE TO DESCRIBE WHAT THIS PR DOES. -->
   
   Fix formating boolean values in tooltips.
   
   ### Fixed issues
   
   #15868
   
   ## Details
   
   ### Before: What was the problem?
   
   Boolean values in data are formatted to be `'-'` for both `true` and `false` 
values in the tooltip.
   
   
   
   ### After: How is it fixed in this PR?
   
   Boolean values in data are formatted to be `'true'` and `'false'` in the 
tooltip.
   
   
   ## Misc
   
   <!-- ADD RELATED ISSUE ID WHEN APPLICABLE -->
   
   - [ ] The API has been changed (apache/echarts-doc#xxx).
   - [ ] This PR depends on ZRender changes (ecomfe/zrender#xxx).
   
   ### Related test cases or examples to use the new APIs
   
   NA.
   
   
   
   ## Others
   
   ### Merging options
   
   - [ ] Please squash the commits into a single one when merge.
   
   ### Other information
   
   Please let me know if `typeof value === 'boolean'` should be wrapped into a 
zrender util method.
   


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