allow zone lookup by partial zip if country hides provinces

lib/worldwide/region.rb

@@ -438,7 +438,10 @@ def zone(code: nil, name: nil, zip: nil)
             search_name == I18n.with_locale(:en) { region.full_name&.upcase }
         end
       else # Worldwide::Util.present?(zip)
-        zone_by_normalized_zip(Zip.normalize(country_code: iso_code, zip: zip))
+        zone_by_normalized_zip(
+          Zip.normalize(country_code: iso_code, zip: zip),
+          allow_partial_zip: hide_provinces_from_addresses,
+        )
       end || Worldwide.unknown_region
     end
 
@@ -496,6 +499,13 @@ def province_optional?
       province_optional || !@zones&.any?(&:province?)
     end
 
+    # Returns true if this country has zones defined, and has postal code prefix data for the zones
+    def has_zip_prefixes?
+      @zones&.any? do |zone|
+        Util.present?(zone.zip_prefixes)
+      end
+    end
+
     private
 
     def add_zone_to_hash(zone)
@@ -542,13 +552,6 @@ def cross_border_zip_includes_province?(zip:, province_code:)
       false
     end
 
-    # Returns true if this country has zones defined, and has postal code prefix data for the zones
-    def has_zip_prefixes?
-      @zones&.any? do |zone|
-        Util.present?(zone.zip_prefixes)
-      end
-    end
-
     def inspected_fields
       INSPECTION_FIELDS.map { |field_name| "@#{field_name}=#{send(field_name).inspect}" }.join(", ")
     end

test/worldwide/region_test.rb

@@ -159,6 +159,18 @@ class RegionTest < ActiveSupport::TestCase
       assert_equal "CA-BC", zone.iso_code
     end
 
+    test "#zone cannot look up a zone by partial zip if country shows provinces" do
+      zone = Worldwide.region(code: "CA").zone(zip: "V6B") # Canada does not hide provinces
+
+      assert_equal Worldwide.unknown_region, zone
+    end
+
+    test "#zone can look up a zone by partial zip if country hides provinces" do
+      zone = Worldwide.region(code: "GB").zone(zip: "SW1") # UK hides provinces
+
+      assert_equal "GB-ENG", zone.iso_code
+    end
+
     test "#zone can look up zones that go by iso_code" do
       [
         ["MX", "AGU", "MXAGU", "MX-AGU", "Aguascalientes"],
@@ -557,5 +569,11 @@ class RegionTest < ActiveSupport::TestCase
       assert Worldwide.region(code: "NZ").province_optional
       refute Worldwide.region(code: "CA").province_optional
     end
+
+    test "#has_zip_prefixes? returns values as expected" do
+      refute_predicate Worldwide.region(code: "FR"), :has_zip_prefixes? # no zones
+      refute_predicate Worldwide.region(code: "AR"), :has_zip_prefixes? # zones but no prefixes
+      assert_predicate Worldwide.region(code: "US"), :has_zip_prefixes? # zones and prefixes
+    end
   end
 end