I learned about an edge case in 'Array.prototype.indexOf' which is fixed in 'Array.prototype.includes'
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I learned how to compare strings in a sane manner using 'String.prototype.localCompare'.
I learned that the IntersectionObserver constructor allows more than one threshold value.
I learned about the power of the UNIX cat command combined with stdin.
I learned how the Unicode mode in JavaScript regular expression helps you counting code points.