how wide is an empty string?
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about the same as a string containing U+200B ZERO WIDTH SPACE
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PHP… roman numeral compatible
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The correct way to optimize Roman numerals is octal with IVXLCDM for 1-7 and overbar (combining leftwards) for digit 0. This forbids leading 0s so it requires empty string for the number zero, which is more systematic anyway if you think about it.
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