ruby-grape / grape / 34032720543

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Stop Endpoint::Options from appending to the caller's path Array (#2907)

`Array(ary)` hands back the very Array it was given, so defaulting an
empty path by appending grew the Array the caller passed in.

A route declared inside a `namespace`, `resource`, `group` or
`route_param` block reaches `Grape::Endpoint` directly, so this is
visible from the public DSL — and a frozen Array raises at boot:

    PATHS = [].freeze

    class API < Grape::API
      namespace :v1 do
        get(PATHS) { 'ok' }   # FrozenError: can't modify frozen Array: []
      end
    end

A top-level route is shielded, but only incidentally: `Grape::API`
replays recorded setup steps through `evaluate_arguments`, which rebuilds
Array arguments with `map`, so the append lands on that copy instead.
Nested scopes run their block against the instance and skip it.

Build a new Array instead. Calling `super` with explicit keywords rather
than zsuper is what removes the need to assign back over the parameter.

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

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