Virtual machine operations

• sgs_Assign - release the current variable and acquire-assign to it from the source
• sgs_ArithOp - run an arithmetic operation (+,-,*,/,%) on two variables to generate a third one
• sgs_IncDec - increment or decrement the specified variable
• sgs_Compare - check if both variables compare equal to each other
• sgs_EqualTypes - check if both variables have the same type and object interface (if both are objects)
• sgs_TypeOf - convert the topmost variable on stack to a type name string
• sgs_DumpVar - convert the topmost variable on stack to a string that contains detailed info about its contents
• sgs_GCExecute - run the garbage collection system to remove all unreachable objects
• sgs_StringConcat - concatenate two or more variables into a string
• sgs_CloneItem - clone the topmost stack item if it's mutable
• sgs_RegSymbol - register a persistent item (symbol) by the specified prefix/name
• sgs_GetSymbol - map name to a registered variable or variable to name using the symbol table
• sgs_Serialize(Ext) - serialize the given variable by converting it recursively to a byte stream
• sgs_Unserialize(Ext) - unserialize the given variable from a byte stream
• sgs_SerializeObject - specify the unserialization function and argument count to use for the object
• sgs_SerializeObjIndex - serialize an object's property/index
• sgs_SerializeSGSON - serialize the given variable into a text format
• sgs_UnserializeSGSON(Ext) - unserialize the given variable from a byte stream