Hi.

You can init spin with big range, and just update spinvalue (example in attach).
Why not?
require "iuplua"

dlg = iup.dialog{
    iup.frame{
        iup.vbox{
            NMARGIN = "8x8",
            iup.text{
                SPIN = 'YES',
                SPINMIN = -100000000,
                SPINMAX =  100000000,
                SPINVALUE = 0,
                valuechanged_cb = function(this)
                    this.SPINVALUE = tonumber(this.VALUE) or this.SPINVALUE
                end,
            },
        },
    },
}


dlg:showxy(iup.CENTER, iup.CENTER)
iup.MainLoop()

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