printf("%d", -2147483648) shows an extra "-"

[tsahara]

(confirmed on OpenBSD/amd64 and MacOS)

% bin/mruby -e 'printf("%d\n", -2147483648)'
--2147483648

It works as expected for -2147483647 and -2147483649:

% bin/mruby -e 'printf("%d\n", -2147483647)'
-2147483647

% bin/mruby -e 'printf("%d\n", -2147483649)'
trace:
    [0] /Users/tsahara/src/mruby/mrbgems/mruby-print/mrblib/print.rb:60:in Kernel#printf
    [1] -e:1
/Users/tsahara/src/mruby/mrbgems/mruby-print/mrblib/print.rb:60: number (-2147483649) too big for integer (ArgumentError)