Changelog:
==========
- Fix and clean node trees iteration methods
- Fix missing raw string for '[^rn]'
- Full and more specific type annotations
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
