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End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

NilClass#===

obj === other → true or false

Case Equality – For class Object, effectively the same as calling ==, but typically overridden by descendants to provide meaningful semantics in case statements.

See also #& #=~ #^ also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1
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