Replacing extract_options! with *args, **options in #2618 breaks callers that pass options as a positional Hash #2851

Description

#2618 replaced several args.extract_options! call sites with an explicit **options (or **kwargs) parameter, e.g. def use(*names, **options) in lib/grape/dsl/parameters.rb. This changes observable behavior for any caller that passes the trailing options as a literal Hash instead of using the ** splat (or bare key: value keywords), because Ruby 3+ no longer auto-converts a trailing Hash argument into keyword arguments unless it is explicitly double-splatted at the call site.

extract_options! and *args, **options are not equivalent:

def debug1(*args)
  options = args.count > 1 ? args.extract_options! : {}
  puts args.inspect
  puts options.inspect
end

def debug2(*args, **options)
  puts args.inspect
  puts options.inspect
end

debug1(:key, :object, { k: :v })
# args: [:key, :object]
# options: {:k=>:v}

debug2(:key, :object, { k: :v })
# args: [:key, :object, {:k=>:v}]
# options: {}

With extract_options!, the trailing hash is pulled out of args and treated as options regardless of how it was passed. With *args, **options, a hash literal (or a hash stored in a variable) that isn't double-splatted stays a positional argument and lands in args, while options is silently empty.

This affects any existing caller who builds an options hash and passes it positionally, e.g.:

params do
  use :pagination, { some: :option }
end

instead of:

params do
  use :pagination, **{ some: :option }
end

The former used to work with extract_options! and silently stops working after #2618, since :pagination and { some: :option } both end up in names and options stays {}.

Steps to reproduce

require 'grape'

class API < Grape::API
  params do
    use :pagination, { max_per_page: 100 }
  end
  get '/items' do
    params
  end
end

Expected behavior

The options hash passed positionally is extracted and forwarded to the named param block, same as before #2618.

Actual behavior

The positional hash is treated as another name in *names instead of being merged into **options, so Params :{max_per_page: 100} not found! is raised (or, more generally, the options are silently dropped).

Additional context