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Static typing in Ruby only works if type narrowing reflects how we actually write Rub

by Giménez Silva Germán Alberto —

https://rubystacknews.com/2026/02/02/introducing-type-guard-to-steep/

This article is based on a RubyKaigi 2025 talk and explores Type Guard in Steep: how union types, framework predicates like present?, and user-defined methods can participate in real type narrowing.

If you use Steep in Rails—or tried and hit its limits—this dives into what changed, why it matters, and how it works under the hood.

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