* `tf.types.experimental.TraceType` now allows custom tf.function inputs to declare Tensor decomposition and type casting support.
    * Introducing `tf.types.experimental.FunctionType` as the comprehensive representation of the signature of `tf.function` callables. It can be accessed through the `function_type` property of `tf.function`s and `ConcreteFunction`s. See the `tf.types.experimental.FunctionType` documentation for more details.

FE15          ; disallowed_STD3_mapped ; 0021          # 4.1  PRESENTATION FORM FOR VERTICAL EXCLAMATION MARK
FE16          ; disallowed_STD3_mapped ; 003F          # 4.1  PRESENTATION FORM FOR VERTICAL QUESTION MARK
FE17          ; mapped                 ; 3016          # 4.1  PRESENTATION FORM FOR VERTICAL LEFT WHITE LENTICULAR BRACKET