If your intention really is to learn then you'd be better of asking questions (e.g. "I don't know F#, would you mind explaining how this selects the biggest palindrome?") instead of making statements that need a qualifier of potentially being wrong.
Being wrong is nothing to be ashamed of, as long as you're ready to stand corrected.
My mistake in this case is that I commented while it was very late 😴 Took note on the approach, though.
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