The subcommand registration in _build_parser() defines a SubCommand
helper class inside the add_cmds_to_parser() closure, so a fresh class
object is created on every call. It also stores command names and
aliases in a dictionary without checking for duplicates, so a colliding
name or alias is silently overwritten, and it relies on every subparser
level sharing the dest = 'command' attribute to descend one level per
re-parse, an invariant that is not documented anywhere.
Hoist the helper to a module-level _SubCommand NamedTuple, log a
warning when a subcommand name or alias collides with an earlier one at
the same level, and document the dest = 'command' invariant next to the
re-parse.
Assisted-by: unsloth/Qwen3.8-27B-GGUF:Q4_K_M with pi.dev v0.84.2
Signed-off-by: Jan Lindemann <jan@janware.com>
Jan Lindemann
3ac649cdf1