Remove deep-freezing via IceNine in favor of Ractor

IceNine is unmaintained and Ractor is maintained by ruby-core

Author: cllns

dry-struct.gemspec

@@ -34,7 +34,6 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency "zeitwerk", "~> 2.6"
   spec.add_runtime_dependency "dry-core", "~> 1.1"
   spec.add_runtime_dependency "dry-types", "~> 1.8", ">= 1.8.2"
-  spec.add_runtime_dependency "ice_nine", "~> 0.11"
   spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "rspec"

lib/dry/struct/value.rb

@@ -1,13 +1,11 @@
 # frozen_string_literal: true
 
-require "ice_nine"
-
 module Dry
   class Struct
     extend Core::Deprecations[:"dry-struct"]
 
     # {Value} objects behave like {Struct}s but *deeply frozen*
-    # using [`ice_nine`](https://github.com/dkubb/ice_nine)
+    # using `Ractor.make_shareable`
     #
     # @example
     #   class Location < Dry::Struct::Value
@@ -21,15 +19,12 @@ class Struct
     #   loc1.frozen? #=> true
     #   loc2.frozen? #=> true
     #   loc1 == loc2 #=> true
-    #
-    # @see https://github.com/dkubb/ice_nine
     class Value < self
       abstract
 
       # @param (see ClassInterface#new)
       # @return [Value]
-      # @see https://github.com/dkubb/ice_nine
-      def self.new(*) = ::IceNine.deep_freeze(super)
+      def self.new(*) = ::Ractor.make_shareable(super)
     end
 
     deprecate_constant :Value

repo-sync.yml

@@ -17,4 +17,3 @@ gemspec:
     - [zeitwerk, "~> 2.6"]
     - [dry-core, "~> 1.1"]
     - [dry-types, "~> 1.8", ">= 1.8.2"]
-    - [ice_nine, "~> 0.11"]