Local value referenced outside of scope.

[crosoftzach]

Local value referenced outside of scope.

[amcgregor]

The annotations extension is undergoing a large amount of rewrite for 3.0 with an eye towards greater capability and simplification. That particular cast closure has been rewritten to support enhanced resolution of "alias-able" types, correctly using passed-in values rather than fragile containing scope.

def cast(key, annotation, value):
	"""Attempt to typecast data incoming from the web."""
	
	annotation = self.aliases.get(annotation, annotation)
	if isinstance(annotation, type) and isinstance(value, annotation): return value  # Nothing to do.
	annotation = self.mapper.get(annotation, annotation)
	
	try:
		value = annotation(value)
	except (ValueError, TypeError) as e:
		raise HTTPBadRequest(f"{e.__class__.__name__}: {e} while processing endpoint argument '{arg}'")
	
	return value