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I have written code to traverse matrices in which I use indices `I` and `J` to iterate over submatrices and indices `i` and `j` to iterate over individual values in a submatrix. Upper/lower case add a new dimension to name things that are related but different.

But is not a deal breaker for me. If the language doesn't let me I can use `ii` or `i2` or whatever.

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> I have written code to traverse matrices in which I use indices `I` and `J` to iterate over submatrices and indices `i` and `j` to iterate over individual values in a submatrix.

Please notice that the first letter in Nim is case-sensitive, so `I` != `i`, and you can continue use your conventions.

And before some new comment starts bashing that, I think this is a must so you can differentiate your types, written in PascalCase, from your variables, written in camelCase.

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