Krikri::KeywordBooleanError

A task KEYWORD's rendered value that ansible's boolean() refuses (become: "{{ ansible_user_id }}" resolving to a username - issue #143). Carries the keyword name and the rendered value so the failure result can build Ansible's own three-link [ERROR] chain (each link Origin'd separately) instead of re-parsing them out of the collapsed brief - a value containing a quote would make that parse unreliable.