On Dec 22, 2013, at 4:45PM, Alex Kocharin <[email protected]> wrote:

>  
> 23.12.2013, 04:36, "Mikeal Rogers" <[email protected]>:
>> 
>>>  * allow aggressive caching, reducing the cost of the npm registry and 
>>> making npm use faster for most use cases
>>  
>> this isn't an issue. the cache control can, and must, be proactively 
>> invalidated on _changes from the database for document urls anyway, it's 
>> trivial to do the same for tarball changes. it can literally cache forever 
>> so long as it responds to pro-active invlaidation.
>  
> HTTP caches know nothing about _changes feed.

NPM can't sit behind a standard HTTP cache on a TTL because a document change 
must take effect immediately. The work going in to putting it behind a cache is 
using a _changes listener to invalidate the cache.

>  
>>  
>> 
>>>  * change behaviour only for version-locked dependencies when that (and 
>>> only that) specific patch is unpublished
>>  
>> i'm not disagreeing with you but when you say things like "change in 
>> behavior" you're sort of sugar coating the fact that packages will fail to 
>> install at a greater rate than they do now. this "change in behavior" is not 
>> trivial, there is no notice sent to someone when their package can no longer 
>> resolve a dependency, it will usually require someone to see a failed 
>> install, report an issue, and the maintainer to intervene. the only way to 
>> avoid this is to never version lock your dependencies which we know people 
>> don't do and that there are tens of thousands of packages in npm today with 
>> some number of version locked deps.
>  
> Patching npm to treat "1.2.3" like "~1.2.3" as a fallback would solve this 
> task. I know it's ugly, but it's no less ugly than unpublishing-republishing 
> practice, because you essentially doing the same thing.

Any changes to npm client take ~2 years to distribute enough that you can 
deprecate the behavior in an old one.

>  
>  
> // alex
> 
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