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Comment: added table of affected functions

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Compliance with this rule is complicated by the fact that the char data type might, in any implementation, be signed or unsigned.

The following character classification routines are affected:

`isalnum()`	`isalpha()`	`isascii()`	`isblank()`
`iscntrl()`	`isdigit()`	`isgraph()`	`islower()`
`isprint()`	`ispunct()`	`isspace()`	`isupper()`
`isxdigit()`	`toascii()`	`toupper()`	`tolower()`

Non-Compliant Code Example

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