In some embodiments, an apparatus can comprise a memory unit including, two or more assemblies, wherein the two or more assemblies include a first assembly and a second assembly, wherein the second assembly is a later version of the first assembly, and wherein the first and second assemblies include, a stub module configured to detect an assembly initialization request indicating one of the first or second assemblies. The stub module can also be configured to retrieve a reference to a symbol table associated with the one of the first and second assemblies indicated in the assembly initialization request, to store data in the symbol table, and to provide the reference to a caller. The memory unit can also comprise an implementation module configured to perform operations associated with symbols in the symbol table and a processor configured to receive and execute one or more of the stub and implementation modules.