case class MutablePair[T1, T2](_1: T1, _2: T2) extends Product2[T1, T2] with Product with Serializable
:: DeveloperApi :: A tuple of 2 elements. This can be used as an alternative to Scala's Tuple2 when we want to minimize object allocation.
- _1
 Element 1 of this MutablePair
- _2
 Element 2 of this MutablePair
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 - MutablePair.scala
 
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Updates this pair with new values and returns itself
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