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* New hierarchy BaseFunction > UserModeFunction, BuiltinFunction.
The old hierarchy still exists for now, to be deleted after migration:
Function > AbstractFunction > MixedModeFunction >
(UserModeFunction, SkylarkFunction > SimpleSkylarkFunction)
(UserModeFunction is already migrated, and
BaseFunction implements Function, for now.)
* Function supports *args and **kwargs when calling functions, and
mandatory named-only parameters in the style of Python 3.
Notable difference with Python: *args binds the variable to a tuple,
because a Skylark list would have to be monomorphic.
* A better, simpler, safer FFI using reflection with BuiltinFunction.
Handles typechecking, passes parameters in a more Java style.
(Not used for now, will be used later.)
* A new annotation @SkylarkSignature, intended to replace @SkylarkBuiltin,
supports the full function call protocol, including default arguments.
* Support for annotating function Factory-s rather than functions.
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MOS_MIGRATED_REVID=88958581
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Francois-Rene Rideau