pub const SPEC_REQUEST: &str = "__usage_spec__";Expand description
The word a tool sends to ask a binary for its own spec.
Not a flag and not a command: a spec request is not something this CLI does, so it is
answered before the parse and stays out of the tables — the same reason
__complete_word__ is a word rather than a subcommand. It also keeps the endpoint from
perturbing the document it prints, which a declared flag would not.