Support .nil? narrowing for local and instance variables#427
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`x.nil?` in conditions now narrows the variable type: the then branch treats x as nil, and the else branch excludes nil. Works with both local variables and instance variables. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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x.nil?in conditions now narrows the variable type: the then branch treats x as nil, and the else branch excludes nil. Works with both local variables and instance variables.