a fix: extend function has a list as a unique parameter
a fix: extend function has a list as a unique parameter


Former-commit-id: d1ab99e1a709c5e50783532d014e97e7057ae9e8
muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous