ruby-grape / grape / 38960015309

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Copy each request's endpoint from a prototype without route-building state

Every request dups its endpoint's prototype, and that copy was the largest
single allocation of a request. Ruby sizes an object by the most instance
variables any object of its class has held, and a copy carried 23: the
route-building state (@prototype, @endpoints, @namespace, @routes,
@helpers), one ivar per filter phase, and the request's own. That put every
copy in a 320-byte slot.

The prototype is now always a separate object that leaves the
route-building state out, @helpers is a local of compile!, and the five
filter phases share one ivar: the frozen callbacks Hash, or nil when no
phase has a filter, so that #run skips all five on one ivar read. A copy
holds 15 and fits a 160-byte slot, with room for three more ivars set by a
route block or a helper. The definition-time endpoint stays under the limit
as well, which matters because without helpers it is a Grape::Endpoint just
like its copies.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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