Issue with rb_time_new()

Ruby 1.8.1
Solaris 9 and FreeBSD 4.9

I've noticed that rb_time_new() doesn't like float values very well. 
Example:

/* timex.c */
#include "ruby.h"
#include <stdio.h>

static VALUE get_time_float(){
   return rb_time_new(1073250153.00003);
}

static VALUE get_time_integer(){
   return rb_time_new(1073250153);
}

void Init_timex(){
   VALUE cTimex = rb_define_class("Timex",rb_cObject);

   rb_define_method(cTimex,"get_time_float",get_time_float,0);
   rb_define_method(cTimex,"get_time_integer",get_time_integer,0);
}

# extconf.rb
require "mkmf"
create_makefile("timex");

# test.rb
$:.unshift Dir.pwd
require "timex"

t = Timex.new
p t.get_time_float   # -> Mon Dec 27 05:12:47 MST 2004
p t.get_time_integer # -> Sun Jan 04 14:02:33 MST 2004

The float value is off.  On FreeBSD 4.9 the float version returns "Mon
Nov 11 00:34:04 PST 1929"!

Is this a case of "don't do that"?  Should I be casting the value passed
to rb_time_new to ensure an integer value?  Or should
time_new_internal() in time.c be altered?

Just curious.

Regards,

Dan