Pie label margin doesn't exist on typing

[Ovilia]

What problem does this feature solve?

When using in TypeScript projects, series[pie].label.margin gets the following error:

Type '{ position: "outer"; alignTo: "edge"; bleedMargin: number; margin: number; }' is not assignable to type 'PieLabelOption'.
  Object literal may only specify known properties, and 'margin' does not exist in type 'PieLabelOption'.ts(2322)

But this option takes effect, so just a problem of typing.

What is expected?

No type error.

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[Ovilia]

margin seems to be renamed to edgeDistance. Document should be updated.