FWIW, most of the books I've converted originally had their chapter titles in upper case. I've converted them all (or nearly all) to mixed case.
To my mind, this type of change isn't messing with the text. Different publishers will print the same text with upper or mixed-cased chapter headings, Arabic or Roman numerals for the chapters, etc. That's all that's happening here.
So I'd vote for the "mixed case" too.
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