Tcl/Tk 9.0.1 possible ttk::spinbox bug

According to:
https://www.tcl-lang.org/man/tcl9.0/TkCmd/ttk_spinbox.html#M18

pathName set value
    Set the spinbox string to value.
    If a -format option has been configured then this format will be
    applied.

So when I run the program below I expect it to show "1.23" in the spinbox
but in fact the entire number is shown.

```
#!/usr/bin/env wish9

proc main {} {
    tk scaling 1.67
    wm title . "Spinbox Test"
    wm minsize . 240 120
    wm attributes . -type dialog
    ttk::spinbox .spinbox -from 1.0 -to 10.0 -format %5.2f -increment 0.1
    ttk::button .quitButton -text Quit -underline 0 -command exit
    bind . <Escape> { exit }
    bind . <Alt-q> { exit }
    pack .spinbox -side top
    pack .quitButton -side top
    .spinbox set 1.23456789
}

main
```