úÎ à —Safe+,0DQR^Lookup a potentially value-less matrix string parameter with boolean semantics. If the param sym] is there without any value, or if it's there with value "true" or "1", it's interpreted as ". Otherwise, it's interpreted as . /book;publishedwould be represented as:import ServantEtype MyApi = "book" :> MatrixFlag "published" :> Get '[JSON] [String];Expresses matrix parameters for path segments in APIs, e.g. /books;author= authornamewould be represented as:import ServantKtype MyApi = "books" :> MatrixParam "author" String :> Get '[JSON] [String] 1servant-matrix-param-0.3.1-JlEprBcwJQw5QynOCq5aGWServant.MatrixParam MatrixFlag MatrixParamWithMatrixParamsghc-prim GHC.TypesTrueFalse