Setting expectations

• Bugs exist

• Lots of bugs exist

• Simple things often aren't
• e.g., :by() adverbs on Ranges ( 1..10:by(2) )
• e.g., lexical variables

• Hard things often aren't
• e.g., .assuming() on subroutines

• Start by reviewing synopses and test suite ...

• ...but don't blindly accept everything you see there.