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The other variants are isLower, isUpperAscii and isLowerAscii Fixes https://github.com/nim-lang/Nim/issues/7963. This commit changes the behavior and signatures of: - isUpper, isLower in the unicode module - isUpperAscii, isLowerAscii in the strutils module A second mandatory parameter skipNonAlpha is added to these 4 procs. (This change affects only for the case where the input is a *string*.) --- With skipNonAlpha set to true, the behavior mimics the Python isupper and islower behavior i.e. non-alphabetic chars/runes are ignored when checking if the string is upper-case or lower-case. Before this commit: doAssert(not isUpper("A B")) After this commit: doAssert(not isUpper("A B", false)) <-- old behavior doAssert isUpper("A B", true) Below two are equivalent: isUpper("A B", true) isAlpha("A B") and isUpper("A B", false) .. and the similar for other 3 procs.