Thanks for your checking.

From: Eli Zaretskii <eliz@gnu.org>

> OK, but please make your patch compare against MOST_POSITIVE_FIXNUM,
> instead of using INT_MAX or LONG_MAX.  Also, if you know that the
> value does not overflow an EMACS_INT, you can simply call make_number,
> instead of make_fixnum_or_float.

I revised the patch as you wrote.
Would you like to check it?

;; supplement
;; check list (with results on 32-bit platforms)

(string-to-number "268435455")		; 2^28 - 1
=>		   268435455
(string-to-number "268435456")		; 2^28
=>		   268435456.0
(string-to-number "268435457")		; 2^28 + 1
=>		   268435457.0
(string-to-number "-268435456")		; - 2^28
=>		   -268435456
(string-to-number "-268435457")		; - 2^28 - 1
=>		   -268435457.0
(string-to-number "536870911")		; 2^29 - 1
=>		   536870911.0
(string-to-number "1073741822")		; 2^30 - 1
=>		   1073741822.0
(string-to-number "2147483647")		; 2^31 - 1
=>		   2147483647.0
(string-to-number "1152921504606846975") ; 2^60 - 1
=>		  1.1529215046068467e+018
(string-to-number "1152921504606846976") ; 2^60
=>		  1.1529215046068467e+018
(string-to-number "1152921504606846977") ; 2^60 + 1
=>		  1.1529215046068467e+018
(string-to-number "-1152921504606846976") ; - 2^60
=>		  -1.1529215046068467e+018
(string-to-number "-1152921504606846977") ; - 2^60 - 1
=>		  -1.1529215046068467e+018
(string-to-number "9223372036854775807") ; 2^63 - 1
=>		  9.223372036854778e+018