IMPL: done with edit_rebase()
REBASE: rename same as in perl
TRY DEVOPS: try something to have lines in asserions
IMPL: +some IOUtils
REBASE: rename
IMPL: done IOUtils
IMPL: more functions
FIXUP: build fix
IMPL: fix mistype
DEBUG: trace
DEBUG: trace mode
FIXUP: fix
REFACTOR: rename
REFACTOR: make Utils.Let, used it in several places
REFACTOR: use the new let