From: ara.t.howard@...
Date: 2006-08-23T04:23:16+09:00
Subject: Re: gem pessimistic versioning - bug?

On Wed, 23 Aug 2006, Jim Weirich wrote:

> unknown wrote:
>> can anyone provide a good reason why both of these should not work?
>>
>>    harp:~ > ruby -r rubygems -e'  require_gem "dynaload", "~> 0.1";  p
>> Dynaload::VERSION  '
>>    "0.2.0"
>
> ~> 0.1 implies that versions 0.x are appropriate choices.  0.2.0 matches
> this criteria.

but why should

   0.1.0 __not__ imply that 0.2.x is appropriate?

according to the 'sane versioning policy' there is no reason i can think of
that it would not be?

i think i may not have been clear.  it think it's correct that

   ruby -r rubygems -e'  require_gem "dynaload", "~> 0.1";  p Dynaload::VERSION  '

load 0.2.0

i thinks an error that

   ruby -r rubygems -e'  require_gem "dynaload", "~> 0.1.0";  p Dynaload::VERSION  '

does __not__


what i mean is, in what way is '0.2.0' not pessimistically compatible with
'0.1.0'?

> ~> 0.1.0 implies that versions 0.1.x are appropriate choices.  Version
> 0.2.0 does not meet that criteria.

why is that though?  i mean, if one follows the gem version rules 0.2.0 __is__
backward compatible with 0.1.0?  it simply has some added features.  am i
missing something?

>>> Gem::Requirement.new("~> 0.1.0").satisfied_by?(Gem::Version.new("0.2.0"))
> => false

this does not agree with the gem versioning policy though?

>> in addition, the error is most misleading...
>
> Suggestions are welcome ...

"#{ requested_version } is too specific or not backward compatible with #{ found }"

> (1) The number of 'digits' compared depends on the number of 'digits' in
> the requirement.  It is not fixed at 2.  ('digits' are in quotes because
> version numbers can be more than single digits, but you know what I
> mean).
>
> (2) The trailing 'digit' can't be ignored.  It must be equal or greater
> than the last 'digit' of the requirment.

but that doesn't make logical sense and ignores the semantics of gem versions
though?  according to the semantics any version

   0.2.x

is backward compatible with 0.1.x and 0.0.x


thanks for the reply btw.

cheers.

-a
-- 
to foster inner awareness, introspection, and reasoning is more efficient than
meditation and prayer.
- h.h. the 14th dali lama