module Sinatra
module Sinatra::Delegator
module Sinatra::Helpers
module Sinatra::Middleware
module Sinatra::Templates
module Sinatra::Templates::ContentTyped
class Rack::Builder
class Sinatra::Application
class Sinatra::BadRequest
class Sinatra::Base
class Sinatra::CommonLogger
class Sinatra::Error
class Sinatra::ExtendedRack
class Sinatra::Helpers::Stream
class Sinatra::IndifferentHash
class Sinatra::Middleware::Logger
class Sinatra::NotFound
class Sinatra::Request
class Sinatra::Request::AcceptEntry
class Sinatra::Request::MimeTypeEntry
class Sinatra::Response
class Sinatra::ShowExceptions
class Sinatra::TemplateCache
class Sinatra::Wrapper
sinatra
4.1.1
# transform_keys
def transform_keys(&block) dup.transform_keys!(&block) end