				# Copyright (C) 2018 The Software Heritage developers
				# See the AUTHORS file at the top-level directory of this distribution
				# License: GNU General Public License version 3, or any later version
				# See top-level LICENSE file for more information

				from types import GeneratorType


				def merge(*dicts):
				"""Given an iterator of dicts, merge them losing no information.

				Args:
				*dicts: arguments are all supposed to be dict to merge into one

				Returns:
				dict merged without losing information

				"""
				def _extend(existing_val, value):
				"""Given an existing value and a value (as potential lists), merge
				them together without repetition.

				"""
				if isinstance(value, (list, map, GeneratorType)):
				vals = value
				else:
				vals = [value]
				for v in vals:
				if v in existing_val:
				continue
				existing_val.append(v)
				return existing_val

				d = {}
				for data in dicts:
				if not isinstance(data, dict):
				raise ValueError(
				'dicts is supposed to be a variable arguments of dict')

				for key, value in data.items():
				existing_val = d.get(key)
				if not existing_val:
				d[key] = value
				continue
				if isinstance(existing_val, (list, map, GeneratorType)):
				new_val = _extend(existing_val, value)
				elif isinstance(existing_val, dict):
				if isinstance(value, dict):
				new_val = merge(existing_val, value)
				else:
				new_val = _extend([existing_val], value)
				else:
				new_val = _extend([existing_val], value)
				d[key] = new_val
				return d

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