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HashMap.SENTINELSSourceval void : tA sentinel value is a special value that must never be supplied as an argument to an operation such as add or find. A non-sentinel value x satisfies x != void && x != tomb. The sentinel values void and tomb must be distinct: that is, void != tomb must hold.
val tomb : tA sentinel value is a special value that must never be supplied as an argument to an operation such as add or find. A non-sentinel value x satisfies x != void && x != tomb. The sentinel values void and tomb must be distinct: that is, void != tomb must hold.