ruby-grape / grape / 33382099315

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Read the params builder setting with `[]` instead of `method_missing`

`Grape::Request#initialize` runs once per request and resolves the default
params builder through `Grape.config.param_builder`. dry-configurable's Config
defines no readers for its settings: the call lands in `method_missing`, which
derives the setting name with `method_name.to_s.tr("=", "").to_sym` — two
throwaway Strings and a slow dispatch, on every request.

`Config#[]` is the same lookup without either. Measured in one process:

    Grape.config.param_builder      282 ns   3 objects
    Grape.config[:param_builder]     44 ns   0 objects   6.4x faster

Three fewer objects allocated per request, on every request, on every endpoint
— confirmed end to end with a deterministic allocation count against a small
API (46.1 -> 43.1 objects for a bare JSON GET).

Nothing else changes: `method_missing` resolves `param_builder` to exactly this
lookup, so a `Grape.config.param_builder = ...` set anywhere still takes effect
the same way.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

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