$ irb
[3.3.6] > h = {a: 1, b: 2}
=> {:a=>1, :b=>2}
[3.3.6] > h.freeze
=> {:a=>1, :b=>2}
[3.3.6] > h.rehash
(irb):3:in `rehash': can't modify frozen Hash: {:a=>1, :b=>2} (FrozenError)
        from (irb):3:in `<main>'
        from <internal:kernel>:187:in `loop'
        from /Users/lopopolo/.local/share/mise/installs/ruby/3.3.6/lib/ruby/gems/3.3.0/gems/irb-1.15.1/exe/irb:9:in `<top (required)>'
        from /Users/lopopolo/.local/share/mise/installs/ruby/3.3.6/bin/irb:25:in `load'
        from /Users/lopopolo/.local/share/mise/installs/ruby/3.3.6/bin/irb:25:in `<main>'

$ bin/mirb
mirb - Embeddable Interactive Ruby Shell
> h = {a: 1, b: 2}
 => {a: 1, b: 2}
> h.freeze
 => {a: 1, b: 2}
> h.rehash
 => {a: 1, b: 2}