Create RactorLocalSingleton#4

Merged

hsbt merged 5 commits intoruby:masterfrom

Oct 1, 2024

Commits on Oct 1, 2024

Improve Ractor-compliance; Create PerRactorSingleton

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Change PerRactorSingleton to RactorLocalSingleton

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Only use RactorLocalSingleton if Ractor is defined

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Clean VERSION freezing

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Make compatible with Ruby 2.4

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