DB2 how to drop overloaded functions

When you try to drop an overloaded function/procedure, DB2 will report a SQL0476N error code.
For example: if function MY_TOCHAR is overloaded with

CREATE FUNCTION MY_TOCHAR(P DATE) RETURNS VARCHAR(50) LANGUAGE SQL RETURN ...
CREATE FUNCTION MY_TOCHAR(P TIME) RETURNS VARCHAR(50) LANGUAGE SQL RETURN ...

And if you want to delete function using:

DROP FUNCTION MY_TOCHAR

You will get following error message:

DB21034E  The command was processed as an SQL statement because it was not a valid Command Line Processor command.  During SQL processing it returned:
SQL0476N  Reference to routine "<SCHEMA>.MY_TOCHAR" was made without a signature, but the routine is not unique in its schema.  SQLSTATE=42725

Solution 1: Drop function with explicit signature, like

DROP FUNCTION MY_TOCHAR(DATE)
DROP FUNCTION MY_TOCHAR(TIME)

Solution 2: Drop function using specific-name

DROP SPECIFIC FUNCTION <specific-name>

The <specific-name> could be found from SYSIBM.SYSROUTINES:

db2 => SELECT NAME, SPECIFICNAME FROM SYSIBM.SYSROUTINES WHERE NAME = 'MY_TOCHAR'

 NAME                SPECIFICNAME            
-------------------- ------------------------
MY_TOCHAR            MY_D3MYTVWGULBL        
MY_TOCHAR            MY_TOCHAR              

db2 => DROP SPECIFIC FUNCTION MY_TOCHAR
DB20000I  The SQL command completed successfully
db2 => DROP SPECIFIC FUNCTION MY_D3MYTVWGULBL
DB20000I  The SQL command completed successfully