Why isNaN(true) ( or (isNaN(false) ) is returning false?
93772
Why is isNaN(null) == false in JS?
106258
What is the reason that an empty string evaluates to false in Javascript
106983
Python `if x is not None` or `if not x is None`?
154049
why does if("string") evaluate "string" as true but if ("string"==true) does not?
128045
Why does this script print an extraneous 'none' in the output
111657
Difference between "if x" and "if x is not None"
10593
How to test whether something is identically NaN?
24142
Boolean Modifiers not working normally
123797
Not equal  != operator on NULL
49616
Why does NOT IN with a set containing NULL always return FALSE/NULL?
153624
What's the difference between is_null($var) and ($var === null)?
41529
Can "nor" be used without "neither"?
158810
Why does >= return false when == returns true for null values?
27495
Why is True returned when checking if an empty string is in another?
60338
Null vs. False vs. 0 in PHP
90115
How can I list the nodes for which a Boolean value is FALSE or NULL?
120997
What is the purpose of new Boolean() in Javascript?