javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL does not work

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Issue

The javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL does not work.
How to submit empty strings as null in JSF since setting javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL to true does not seem to work ?

Environment

Red Hat JBoss Enterprise Application Platform (EAP)
- 6.x
- 5.x

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