segment "register" "x" does not work in IDA (even in 7.0) when using script commands

[g0me3]

When using "x" word for a segment register name, all is fine while you change it from IDA using the GUI windows (Alt+G), But as soon as you try to use script command SetReg(), you won't be allowed to change "x" reg value at all, IDA always returns "0" as a function result. changing this name to any other solves t he problem.

This is some kind of internal IDA problem but kinda annoying if you want to use some scripting here.