Stop text cursor from blinking: changing NSTextInsertionPointBlinkPeriodOff value to zero has no effect
For example, TextEdit displays the text cursor blink-period-off rate as the default 1000 milliseconds when I set the value to 0 in terminal (still blinking). For all other values (like 200, for example), the displayed rate corresponds to the set rate.
MacBook Pro 13″, macOS 13.5