`Symbol#to_s` returns a frozen String

[postmodern]

Symbol#to_s returns a frozen String on JRuby 9.4, but under CRuby 3.1 it returns a new unfrozen String.

sym = :foo
str = sym.to_s
str.frozen?

Environment Information

• jruby 9.4.0.0 (3.1.0) 2022-11-23 95c0ec159f OpenJDK 64-Bit Server VM 17.0.5+8 on 17.0.5+8 +jit [x86_64-linux]

Expected Behavior

# => false

Actual Behavior

# => true