freeze_dedupe_strings

🦾 Freeze and dedupe strings to reduce memory

Freezing strings (String#freeze) allows the interpreter to dedupe identical literals at compile time (--enable=frozen-string-literal=all) or at runtime via String#-@. Combined with String#+@, you can canonicalize user input on the fly, reducing GC pressure in long‑running processes.

# Deduplicate a runtime string
raw = String.new("config_option")
canon = +raw.freeze   # +raw invokes String#-@ then freeze
# both references now share the same frozen object
puts raw.equal?(canon)  # => true