[viraptor]

> it has mutable strings a-la Perl

Yes, but they're not popular these days. Ruby 3 almost defaulted to frozen-strings by default (I wish it had) and a lot of the ecosystem moved to that style resulting in some nice memory saving. Rails enforces it on its code for example: https://github.com/rails/rails/blob/0f09dfca363410f51f6f6078...

[mbell]

You are talking about string _literals_, there is no motion nor interest I'm aware of in making all strings immutable in Ruby, thankfully.