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Say not to use concat for integers.
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@ -218,11 +218,11 @@ not @code{eq} to any existing string.
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When an argument is an integer (not a sequence of integers), it is
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converted to a string of digits making up the decimal printed
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representation of the integer. This special case exists for
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compatibility with Mocklisp, and we don't recommend you take advantage
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of it. If you want to convert an integer to digits in this way, use
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@code{format} (@pxref{Formatting Strings}) or @code{number-to-string}
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(@pxref{String Conversion}).
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representation of the integer. @string{Don't use this feature---it
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exists for historical compatibility only, and we plan to change it by
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and by.} If you wish to convert an integer to a decimal number in this
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way, use @code{format} (@pxref{Formatting Strings}) or
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@code{number-to-string} (@pxref{String Conversion}).
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@example
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@group
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