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From: Alan Grunwald <nospam.nurdglaw@gmail.com>
Newsgroups: comp.lang.tcl
Subject: Re: BUG: wrong usage for package loading with multiple versions
 available
Date: Wed, 30 Apr 2025 17:15:25 +0100
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On 30/04/2025 11:06, aotto1968 wrote:
> hi,
> 
> The "-exact" option does NOT include the PARTIAL version number. To use the
> tcltest-2.3.8 package the EXACT version have to be "known".
> 
> The CORE problem is that tcltest-2.3 and tcltest-2-5 have partly DIFFERENT
> syntax. The command "package require tcltest 2.3" should load the LATEST
> patch level from "tcltest-2.3.X"
> 
> 
> package require Tcl 8.5
>  > 8.5.19
> package versions tcltest
>  > 2.3.8 2.5.3
> info library
>  > /path/to/lib/tcl8.5
> catch {package require -exact tcltest 2.3} msg
>  > 1
> set msg
>  > can't find package tcltest exactly 2.3
> package require tcltest 2.3
>  > 2.5.3
> 
> 
> package require Tcl 8.5
>  > 8.6.12
> package versions tcltest
>  > 2.3.8 2.5.3
> info library
>  > /path/to/lib/tcl8.6
> catch {package require -exact tcltest 2.3} msg
>  > 1
> set msg
>  > can't find package tcltest exactly 2.3
> package require tcltest 2.3
>  > 2.5.3
OK. I'll bite.

 From the manpage,

"package require -exact package version
"    This form of the command is used when only the given version of 
package is acceptable to the caller."

Since 2.5.3 isn't exactly 2.5, [package require -exact tcltest 2.5] 
fails is only version 2.5.3 is available.

The second line of the manpage quote above goes on to state.

"This command is equivalent to package require package version-version."

I haven't checked, because I am, frankly, not interested, but

package require tcltest 2.3-2.3.9 might do what you want.