After alias
master: 3,1,2,3,a,b,c,d
attrib: a,b,c,d

After change
master: 3,1,2,3,z,b,c,d
attrib: z,b,c,d

After splice
master: 4,1,6,2,3,z,b,c,d
attrib: z,b,c,d