If I try to specify that a game cost me nothing, I cannot record it in private info. When I enter a Price Paid value of 0.00 and click save, the private info does not display Price Paid at all. When I go back to edit, it is displayed as 0 instead of 0.00. If I save 0, next time I edit the value is null instead of 0.
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» BGG Bugs
Price Paid field does not handle zero values correctly: they get altered to null.