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This property is assigned to characters whose principal function is to extend the value of a preceding alphabetic character or to extend the shape of adjacent characters. Typical of these are length marks, iteration marks, and the Arabic tatweel. These are not to be confused with diacritics.

Support for the Extender character property is enabled in the JSON configuration file with:

{
    "characterProperties": [
        "Extender"
    ]
}