Re: Less allocated objects on each request

[Aaron Patterson <tenderlove@ruby-lang.org>]

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On Fri, Jun 17, 2016 at 02:43:54PM -0500, richard schneeman wrote:
> I have a PR that removes all those constants in rack.rb in favor of string literals:
> https://github.com/rack/rack/pull/1085

Eric,

Here's a link to the raw diff if you want to take a look:

  https://patch-diff.githubusercontent.com/raw/rack/rack/pull/1085.diff

Now that I'm reading this patch, removing the constants worries me
because of backwards compatibility issues.  I think removing the
`freeze` is fine, and setting the magic comment to use frozen strings
would be good.  But removing the constants seems dangerous since other
libraries use those constants.

Could we just remove the freeze and add the magic comment to that file
that defines the constants?

> I also found some places where we should still use `.freeze` in a few cases. There are also some other constants buried around the project, this PR is only the main constants.
> 
> Eric & Aaron: on a separate non-rack note, I could use some of your Ruby internals expertise on a performance tuning patch to Sprockets involving `case`. Mostly why is the `case` code not faster than using a hash. Here is the discussion: 
> 
> https://github.com/rails/sprockets/pull/312#issuecomment-226369234

I left a comment.  Basically the case statement is doing an is_a? where
the hash version is just doing an equality on the class.

-- 
Aaron Patterson
http://tenderlovemaking.com/

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