[C#]
    bool ContainsKey(string Key);
    bool ContainsKey(byte[] Key);

[VB.NET]
    Function ContainsKey(ByVal Key As String) As Boolean
    Function ContainsKey(ByVal Key As Byte()) As Boolean

[Pascal]
    under development

[C++]
    bool ContainsKey(const std::string &Key);
    bool ContainsKey(const std::vector<uint8_t> &Key);

[PHP]
    bool ContainsKey(string $Key)
    bool ContainsKey(array of byte|string|NULL $Key)

[Java]
    boolean containsKey(byte[] Key);
    boolean containsKey(String Key);