Simply send mutator logic for naked receiver
Simply early return into guard
Reduce rendundancy in YARD docs
Fix assignment? predicate in send mutator to be more explicit
Refactor early return and guard into one guard
Fix duplication cross send mutator predicates
Avoid repeated negation
Merge predicate with one call side to guard
Merge early return with guard
Fix style
Kill dead code
Fix YARD docs
Remove useless mutations and fix index reference