05 — Literals

What Ruby does with a string before your code touches it: whether the literal may be changed, and how much of a heredoc's indentation survives.

Lesson	The one thing
String literals are chilled, not frozen	Ruby 3.4 and 4.0: a warning, not yet an error
<<~ strips indentation — by a different rule than Perl's	least-indented line, or closing word