add CAVEATS.
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@ -1,4 +1,4 @@
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.\" $NetBSD: iswalnum.3,v 1.4 2002/03/18 08:03:39 wiz Exp $
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.\" $NetBSD: iswalnum.3,v 1.5 2002/07/10 14:46:10 yamt Exp $
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.\"
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.\" Copyright (c) 1991 The Regents of the University of California.
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.\" All rights reserved.
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@ -112,3 +112,6 @@ return non-zero if the character tests true.
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.Sh STANDARDS
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The functions conform to
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.St -isoC99 .
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.Sh CAVEATS
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The argument to these functions must be WEOF or valid wchar_t
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value with current locale; otherwise, the result is undefined.
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