Today I nearly made a wrong connection for debugwire with the squid cable.
It is normal practice to use cable color coding as used on resistors for many years :
0 : black
1 : brown
2 : red
3 : orange
4 : yellow
5 : green
6 : blue
7 . purple
8 : grey
9 : white
On a 10 wire flat cable wire 1 is normally brown, and wire 10 is black
The squid cable is upside down, wire 1 is black, wire 10 is brown.
Luckily i checked the documentation before connecting.
I don't understand why this does not stick to normal practice. It is an unnescessary mind twister, now you are warned.