refactor(tfidf): simplify ngram validation with all?(Integer)

Author: cardmagic

lib/classifier/tfidf.rb

@@ -237,9 +237,7 @@ def validate_df!(value, name)
     # @rbs (Array[Integer]) -> void
     def validate_ngram_range!(range)
       raise ArgumentError, 'ngram_range must be an array of two integers' unless range.is_a?(Array) && range.size == 2
-      raise ArgumentError, 'ngram_range values must be positive integers' unless range.all? do |v|
-        v.is_a?(Integer) && v.positive?
-      end
+      raise ArgumentError, 'ngram_range values must be positive integers' unless range.all?(Integer) && range.all?(&:positive?)
       raise ArgumentError, 'ngram_range[0] must be <= ngram_range[1]' if range[0] > range[1]
     end