how to change cursorStyle? (to turn off blinking)

[hyperpallium]

Inspecting xtermjs source, does seem to implement DECSCUSR \e[# q (where # is [0-7], \e[2 q is a steady block) in InputHandler.ts, but it has no effect in the single.py demo.

How to make echo -e '\e[2 q' work? (equivalent to \033[2 q, or \x1b[2 q)

Or some other way so the cursor doesn't blink.