[softwarefailure]

Any difference if you boot using WB 3.1 disk? (with required lib copied to libs: )

I have a plain OS 3.1 installation on WinUAE and it shows the very same result. I get:

{
        "inttable": [
                1,
                2,
                3.0000000000000004,
                4,
                5
        ]
}

My CPU/FPU settings for the test are attached to this post.

Do you get same behavior when you select 64-bit FPU? And do you get different or same results as above?

No, with a 64-bit FPU I get different results. In that case the values are even more off. This is the result with Host (64-bit) mode:

{
	"inttable": [
		1.0000000000000004,
		2.0000000000000008,
		3.0000000000000013,
		4.0000000000000017,
		5.0000000000000017
	]
}