Add protected pprint.PrettyPrinter methods
Protected method types are needed for sub-classing support. Else mypy complains like:
"PrettyPrinter" has no attribute "_format_dict_items".
According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉
According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉
According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉
According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉
According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉
According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉