Authors: Axis Sivitz
License: MIT
Summary: Allows easy creation of immutable union values, a.k.a. sum-types.
Example:
APICallResult = UnionValue.new(:success, :failure, :timeout)
APICallResult.failure.is_failure? #=> true
APICallResult.timeout.is_success? #=> false
APICallResult.success(12345).data #=> 12345
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