diff --git a/spec/internet_spec.cr b/spec/internet_spec.cr
index c838a28..f5179f4 100644
--- a/spec/internet_spec.cr
+++ b/spec/internet_spec.cr
@@ -51,7 +51,7 @@ describe Faker::Internet do
     (1..32).to_a.each do |min_length|
       (min_length + 1..33).each do |max_length|
         u = Faker::Internet.user_name((min_length...max_length), %w(=))
-        assert { u.size.between? min_length, max_length - 1 }
+        assert { min_length <= u.size <= max_length - 1 }
         assert { u.match(/\A[a-z]+((=)?[a-z]*)*\z/) }
       end
     end
diff --git a/src/faker/finance.cr b/src/faker/finance.cr
index 5016536..a501f43 100644
--- a/src/faker/finance.cr
+++ b/src/faker/finance.cr
@@ -2,7 +2,7 @@ module Faker
   class Finance
     CREDIT_CARD_TYPES = (Data["credit_card"] as Hash).keys
 
-    def self.credit_card(types = [] of Array(String) : Array)
+    def self.credit_card(types : Array = [] of Array(String))
       types = CREDIT_CARD_TYPES if types.empty?
       type = types.sample