In the Persian alphabet the numerals 4,5 and 6 are different from the standard numerals used for Arabic. When the OpenType feature ‘localised forms’ detects the Farsi language, it uses the correct numeral forms.
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ON
Standard Ligatures
Necessary Ligatures for a harmonious flow and correct script grammar.
OFF
ON
Localised Forms (Urdu)
In the Urdu alphabet, the numerals 4,5, 6 and 7 are different from the standard numerals used in Arabic. When the OpenType feature ‘localised forms’ detects the Urdu language, it uses the correct numeral forms.