Pretty sure it's limited due to iOS. Because it does allow period to be added.

Just checked with the iOS keyboard development guide and app store review and see no rules against it. Why are you pretty sure it is limited due to the OS?

	▲	whycome 3 days ago \| parent [-]
		Because the exact same feature is available on the Android version. No other ios keyboard has it. And the default ios keyboard doesn't have it. I'm not sure of another reason.