Miss Dada  🏳️‍⚧️

@yukihiro_matz So you need the magic comment in Ruby 3.0 to get frozen strings?

@wycats No, you just need magic comment for mutable string literals after Ruby3.0.

@yukihiro_matz This could become like Python 3. It can break gems that mutate strings (gsub! even) and will be hard to track down.

@wycats I understand your concern. old programs will run by adding one line of magic comment though.

@yukihiro_matz old programs, but not old gems.

@yukihiro_matz most programs have dozens or hundreds of third party dependencies.

@yukihiro_matz and a gem returning an immutable string may be fine in isolation, but when passed to another gem,

@yukihiro_matz in other words, gems don't say "I take a mutable string", they say "I take a string", so the problems will be subtle.