diff --git a/Library/Homebrew/cache_store.rb b/Library/Homebrew/cache_store.rb
index 51c4492529..e28795d4bf 100644
--- a/Library/Homebrew/cache_store.rb
+++ b/Library/Homebrew/cache_store.rb
@@ -38,6 +38,15 @@ class CacheStoreDatabase
     return_value
   end
 
+  # Creates a CacheStoreDatabase.
+  #
+  # @param  [Symbol] type
+  # @return [nil]
+  def initialize(type)
+    @type = type
+    @dirty = false
+  end
+
   # Sets a value in the underlying database (and creates it if necessary).
   def set(key, value)
     dirty!
@@ -120,15 +129,6 @@ class CacheStoreDatabase
     @db ||= {}
   end
 
-  # Creates a CacheStoreDatabase.
-  #
-  # @param  [Symbol] type
-  # @return [nil]
-  def initialize(type)
-    @type = type
-    @dirty = false
-  end
-
   # The path where the database resides in the `HOMEBREW_CACHE` for the given
   # `@type`.
   #
diff --git a/Library/Homebrew/utils/spdx.rb b/Library/Homebrew/utils/spdx.rb
index 65a307770f..1fe89ae6fa 100644
--- a/Library/Homebrew/utils/spdx.rb
+++ b/Library/Homebrew/utils/spdx.rb
@@ -39,8 +39,8 @@ module SPDX
   end
 
   def parse_license_expression(license_expression)
-    licenses = []
-    exceptions = []
+    licenses = T.let([], T::Array[T.any(String, Symbol)])
+    exceptions = T.let([], T::Array[String])
 
     case license_expression
     when String, Symbol