Chicken 5 compilation, coerced inexact literal number warning. What am I missing here?

[Matt Welland]

This one I sort of understand but it does seem annoying:

Warning: coerced inexact literal number `9e+99' to fixnum 8999999999999999948859130765266355329578537025198862586562510896759102769772101980841694466750283776

but the following I don't understand:

This line:

(define megatest-version 1.6584)

generates this warning:

Warning: literal is out of range - will be truncated to integer: 1.6584

But a small test program works fine:

$ cat testit.scm
(module testit
*
(import scheme)
(define abc 1.2345)
)

(import testit)
(print (/ abc 2))

$ csc testit.scm

$ ./testit
0.61725

--

Complexity is your enemy. Any fool can make something complicated.

It is hard to keep things simple. - Richard Branson.