Sql-server – How to update a CLR Assembly without dropping assembly from SQL Server

How can i update a CLR function (or procedure) assembly dll without having to drop and re-create the assembly in SQL Server (2008 R2)?

As it stands now if i update an assembly (e.g. to add a new function), SQL Server will not honor the updated dll until i drop the assembly:

DROP ASSEMBLY CLRFunctions

Msg 6590, Level 16, State 1, Line 1
DROP ASSEMBLY failed because 'CLRFunctions' is referenced by object 'NormalizeString'.

But before i can drop the assembly, i must first drop all functions that reference it:

DROP FUNCTION NormalizeString
DROP FUNCTION RemoveDiacritics
DROP FUNCTION RemoveCombiningDiacritics
DROP FUNCTION CombineLigatures
....
DROP FUNCTION PseudolocalizeArabic

And then i can drop the assembly:

DROP ASSEMBLY CLRFunctions

Now i have to "create" the assembly:

CREATE ASSEMBLY CLRFunctions FROM 'c:\foos\CLRFunctions.dll';

And now i have to hunt the declaration of all the UDF's that were registered before i deleted them.

i would rather update an assembly, and have SQL Server begin using it.

Update: i randomly tried DBCC FREEPROCCACHE to force a "recompile", but SQL Server still uses the old code.

Update: i deleted the assembly dll CLRFunctions.dll, and SQL Server is still able to run the code (without code that should be impossible).