Re: [TCLCORE] TIP #339: Case-Insensitive Package Names

[<dg...@ni...>]

>> For non-interactive use the same would fail, but the error message
>> could be extended with a hint about availiable near-matches:
>>
>> can't find package tk (perhaps you meant Tk)

That's not the way the [package require] implementation
makes use of the [package unknown] handler.

As written, [package require tk $requirement] will pass
along arguments "tk" and $requirement (if any) to the
[package unknown] handler.  The contract is that the
[package unknown] handler should find packages that
match what it was told to look for.  If it wants, it can
look for other things too and the default one does, but
that has not been required.

So, either we would need to change the contract so that
[package unknown] handlers are expected to search
for matching packages of all cases variations, causing
some existing [package unknown] handlers to become
"broken" according to the new standard, or [package require]
would need to iterate over all the case variations and
call the [package unknown] handler again and again until
at least something satisfying the requirement appeared, or
possibly until all cases were covered.

DGP