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Maintenance Ruby 3.4 gets fixes, but no new features. Switch to Ruby 4.0 →

instance method

Thread#[]=

(::interned key, untyped value) -> untyped
thr[sym] = obj → obj

Attribute Assignment—Sets or creates the value of a fiber-local variable, using either a symbol or a string.

See also Thread#[].

For thread-local variables, please see thread_variable_set and thread_variable_get.