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Remove duplicate values from a [[PTPScript:Types:String|String]], [[PTPScript:Types:Number|Number]], or [[PTPScript:Types:Array|Array]].

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**Syntax**
  * ''[[PTPScript:Types:Mixed|Mixed]] unique( [[PTPScript:Types:Mixed|Mixed]] subject )''

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**Parameters**
  * [[PTPScript:Types:Mixed|Mixed]] ''subject'' - The entity to remove duplicate values from.
    * [[PTPScript:Types:String|String]] - The String will be purged of duplicate characters.
    * [[PTPScript:Types:Number|Number]] - The Number will be treated as a String.
    * [[PTPScript:Types:Array|Array]] - The Array will be purged of duplicate items. Keys are preserved where possible.

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**Result**
  * [[PTPScript:Types:Mixed|Mixed]] - The modified ''subject''.
    * [[PTPScript:Types:String|String]] - If ''subject'' is a String or Number.
    * [[PTPScript:Types:Array|Array]] - If ''subject'' is an Array.
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Returns ''subject'' with duplicate elements removed.