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02-loop.md file - explanation of loop variable names does not mention limitations on the names #364
What's in a name? part mentions that any name can be used as a loop variable. IMHO it is worthwhile mentioning here that there are certain rules and limitations on naming the variables even if these rules and limitations are mentioned someplace else. An important thing to consider would be case sensitivity, for one. Also, the scope of a loop variable would be worthwhile mentioning, too - it may lead to confusions.