From 58b50badef728ad3661ed5e3b86db73f9c6ef176 Mon Sep 17 00:00:00 2001
From: Caleb Xu <calebcenter@live.com>
Date: Thu, 25 Apr 2024 17:00:02 -0400
Subject: [PATCH] checksum: enable strict typing

---
 Library/Homebrew/checksum.rb | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Library/Homebrew/checksum.rb b/Library/Homebrew/checksum.rb
index 30d0d2f22e..b79cc30127 100644
--- a/Library/Homebrew/checksum.rb
+++ b/Library/Homebrew/checksum.rb
@@ -1,4 +1,4 @@
-# typed: true
+# typed: strict
 # frozen_string_literal: true
 
 # A formula's checksum.
@@ -7,14 +7,17 @@
 class Checksum
   extend Forwardable
 
+  sig { returns(String) }
   attr_reader :hexdigest
 
+  sig { params(hexdigest: String).void }
   def initialize(hexdigest)
-    @hexdigest = hexdigest.downcase
+    @hexdigest = T.let(hexdigest.downcase, String)
   end
 
   delegate [:empty?, :to_s, :length, :[]] => :@hexdigest
 
+  sig { params(other: T.any(String, Checksum, Symbol)).returns(T::Boolean) }
   def ==(other)
     case other
     when String