Support 6-digit postcodes in PY

Author: BenMorel

src/Formatter/PYFormatter.php

@@ -11,16 +11,15 @@
 /**
  * Validates and formats postcodes in Paraguay.
  *
- * Postcodes consist of 4 digits, without separator.
+ * Postcodes consist of 4 digits before June 2018 and 6 digits thereafter, without a separator.
  *
  * @see https://en.wikipedia.org/wiki/List_of_postal_codes
- * @see https://en.wikipedia.org/wiki/List_of_postal_codes_of_Paraguay
  */
 final class PYFormatter implements CountryPostcodeFormatter
 {
     public function format(string $postcode): ?string
     {
-        if (preg_match('/^[0-9]{4}$/', $postcode) !== 1) {
+        if (preg_match('/^(?:[0-9]{4}|[0-9]{6})$/', $postcode) !== 1) {
             return null;
         }
 

tests/Formatter/PYFormatterTest.php

@@ -23,6 +23,8 @@ public function providerFormat(): array
             ['123', null],
             ['1234', '1234'],
             ['12345', null],
+            ['123456', '123456'],
+            ['1234567', null],
 
             ['A', null],
             ['AB', null],