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(String Conversion) <string-to-number>: Document
that a float is returned for integers that are too large.
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@ -536,7 +536,9 @@ This function returns the numeric value of the characters in
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in that base. If @var{base} is @code{nil}, then base ten is used.
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Floating point conversion always uses base ten; we have not implemented
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other radices for floating point numbers, because that would be much
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more work and does not seem useful.
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more work and does not seem useful. If @var{string} looks like an
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integer but its value is too large to fit into a Lisp integer,
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@code{string-to-number} returns a floating point result.
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The parsing skips spaces and tabs at the beginning of @var{string}, then
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reads as much of @var{string} as it can interpret as a number. (On some
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