我使用 pine 脚本，我想检查某些变量是否为 NA。说：
float value = na
if value == na
// do something
As far as I am aware, the manual says that it is not guaranteed to work. Are there any alternatives to check if a variable is NA? I can't assign it to 0 though, since the outcome value can be 0.0 in my script. I am new to Pine Script. Thanks!