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Pie: Label Edge Cases

A repeated label keeps its first value, single-quoted and escaped labels are accepted, and markup characters are shown as text.

pie-label-edge-cases.mmd
pie title Labels <&> "quotes"
  "R&D" : 30
  'Single quoted' : 25
  "<script>" : 20
  "Say \"hi\"" : 15
  "R&D" : 99
  'It\'s' : 10
Output
Pie chart, Zombie Mermaid 30% 25% 20% 15% 10% Labels <&> "quotes" R&D Single quoted <script> Say "hi" It's

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