Add the following code in an extension:

console.log('true vs true');
console.log('true vs false');
console.log('false vs true');
console.log('false vs false');

When it runs, the colours of the output lines are inconsistent:

Looking in the dev tools, it seems the blue lines have boolean in their CSS class which is missing from the white lines. It seems strange that true vs false and false vs true are categorised differently.