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From: Ralf Fassel <ralfixx@gmx.de>
Newsgroups: comp.lang.tcl
Subject: Re: BUG: wrong usage for package loading with multiple versions available
Date: Fri, 02 May 2025 18:33:40 +0200
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* aotto1968 <aotto1968@t-online.de>
| ok, lets check

I would suggest to read *and understand* the 'package' manpage.

| package versions tcltest
| > 2.3.8 2.5.3
| # BUG: 2.3 have to pic-up latest patch of the 2.3
| package require tcltest 2.3

Why?  manpage says otherwise:

              A suitable version of the package is any version which satisfies
              at least one of the requirements, per the rules of package vsat-
              isfies.  If  multiple  versions  are suitable the implementation
              with the highest version is chosen.

Note the last sentence.

| # Bug: upper limit does NOT works at all
| package require tcltest -2.3.9

Why should that work at all?

     Each requirement is allowed to have any of the forms:

              min    This form is called “min-bounded”.

              min-   This form is called “min-unbound”.

              min-max
                     This form is called “bounded”.

There is no '-max' mode.

| # BUG: 2.3.8 is NOT of the solution
| package require tcltest 2.3-2.3.8

As stated in the manpage:

              [2]    A version satisfies a “bounded” requirement when

--<snip-snip>--
                     [b]    Otherwise if, and only if the version  is  greater
                            than  or  equal to the min, and less than the max,
                            where both min and max have been padded internally
                            with  “a0”.  Note that while the comparison to min
                            is inclusive, the comparison to max is exclusive.
Note the last sentence.

| # OK - only case that works
| package require tcltest 2.3-2.3.9

As stated in the manpage, same as last point.

HTH
R'