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Backend code (Java)
Collection<Integer> data = new ArrayList();
sfsObj.putIntArray("data", data);

I got exception from Client side when I try this code;
sfsObject.GetValue<int[]>("data");

InvalidCastException: Unable to cast object of type 'SFSArrayLite' to type 'Int32[]'.
at Sfs2X.Entities.Data.SFSObject.GetValue[Object] (System.String key) [0x00000] in <filename unknown>:0


Unity version : 5.5.0f3
Smartfox Client version : 1.6.6
Smartfox Backend version : 2.9.2 ( Same error 2.12.0)
Plaform : WebGL (No problem on Android , IOS)

Actually the GetValue method is an internal method that you should not use.
Please use sfsObject.GetIntArray(). This should fix it.

PS: we will make that method private in future releases of the API, to avoid this situation.