diff --git a/.gitignore b/.gitignore
index 942b7a0..d012dd1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 vendor/
 tests/coverage/
+/tests/.phpunit.result.cache
 perf/docs/
 .php_cs.cache
 
diff --git a/tests/cases/Encoding/TestGB18030.php b/tests/cases/Encoding/TestGB18030.php
index 3e3a722..293b1d7 100644
--- a/tests/cases/Encoding/TestGB18030.php
+++ b/tests/cases/Encoding/TestGB18030.php
@@ -29,7 +29,7 @@ class TestGB18030 extends \MensBeam\Intl\Test\CoderDecoderTest {
     /* This string contains an invalid character sequence sandwiched between two null characters */
     protected $brokenChar = "00 FF 00";
 
-    public function tearDown() {
+    public function tearDown(): void {
         $this->testedClass = GB18030::class;
     }
 
diff --git a/tests/phpunit.xml b/tests/phpunit.xml
index 3e4f06d..4874644 100644
--- a/tests/phpunit.xml
+++ b/tests/phpunit.xml
@@ -7,7 +7,6 @@
     convertWarningsToExceptions="false"
     beStrictAboutTestsThatDoNotTestAnything="true"
     beStrictAboutOutputDuringTests="true"
-    beStrictAboutTestSize="true"
     stopOnError="true">
 
 <filter>
diff --git a/vendor-bin/phpunit/composer.json b/vendor-bin/phpunit/composer.json
index d5297b5..4c4844e 100644
--- a/vendor-bin/phpunit/composer.json
+++ b/vendor-bin/phpunit/composer.json
@@ -1,5 +1,5 @@
 {
     "require": {
-        "phpunit/phpunit": "^6.5"
+        "phpunit/phpunit": "^8.5"
     }
 }
diff --git a/vendor-bin/phpunit/composer.lock b/vendor-bin/phpunit/composer.lock
index 5cdd5c8..11c221a 100644
--- a/vendor-bin/phpunit/composer.lock
+++ b/vendor-bin/phpunit/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "6ab8c6547639fd5c764028db5efd251c",
+    "content-hash": "e50881c0f2037e8a7d7880aca03df8cc",
     "packages": [
         {
             "name": "doctrine/instantiator",
@@ -112,22 +112,22 @@
         },
         {
             "name": "phar-io/manifest",
-            "version": "1.0.1",
+            "version": "1.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/manifest.git",
-                "reference": "2df402786ab5368a0169091f61a7c1e0eb6852d0"
+                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phar-io/manifest/zipball/2df402786ab5368a0169091f61a7c1e0eb6852d0",
-                "reference": "2df402786ab5368a0169091f61a7c1e0eb6852d0",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
+                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
                 "ext-phar": "*",
-                "phar-io/version": "^1.0.1",
+                "phar-io/version": "^2.0",
                 "php": "^5.6 || ^7.0"
             },
             "type": "library",
@@ -163,20 +163,20 @@
                 }
             ],
             "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
-            "time": "2017-03-05T18:14:27+00:00"
+            "time": "2018-07-08T19:23:20+00:00"
         },
         {
             "name": "phar-io/version",
-            "version": "1.0.1",
+            "version": "2.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/version.git",
-                "reference": "a70c0ced4be299a63d32fa96d9281d03e94041df"
+                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phar-io/version/zipball/a70c0ced4be299a63d32fa96d9281d03e94041df",
-                "reference": "a70c0ced4be299a63d32fa96d9281d03e94041df",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/45a2ec53a73c70ce41d55cedef9063630abaf1b6",
+                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6",
                 "shasum": ""
             },
             "require": {
@@ -210,7 +210,7 @@
                 }
             ],
             "description": "Library for handling version information and constraints",
-            "time": "2017-03-05T17:38:23+00:00"
+            "time": "2018-07-08T19:19:57+00:00"
         },
         {
             "name": "phpdocumentor/reflection-common",
@@ -427,40 +427,40 @@
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "5.3.2",
+            "version": "7.0.10",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "c89677919c5dd6d3b3852f230a663118762218ac"
+                "reference": "f1884187926fbb755a9aaf0b3836ad3165b478bf"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/c89677919c5dd6d3b3852f230a663118762218ac",
-                "reference": "c89677919c5dd6d3b3852f230a663118762218ac",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/f1884187926fbb755a9aaf0b3836ad3165b478bf",
+                "reference": "f1884187926fbb755a9aaf0b3836ad3165b478bf",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
                 "ext-xmlwriter": "*",
-                "php": "^7.0",
-                "phpunit/php-file-iterator": "^1.4.2",
+                "php": "^7.2",
+                "phpunit/php-file-iterator": "^2.0.2",
                 "phpunit/php-text-template": "^1.2.1",
-                "phpunit/php-token-stream": "^2.0.1",
+                "phpunit/php-token-stream": "^3.1.1",
                 "sebastian/code-unit-reverse-lookup": "^1.0.1",
-                "sebastian/environment": "^3.0",
+                "sebastian/environment": "^4.2.2",
                 "sebastian/version": "^2.0.1",
-                "theseer/tokenizer": "^1.1"
+                "theseer/tokenizer": "^1.1.3"
             },
             "require-dev": {
-                "phpunit/phpunit": "^6.0"
+                "phpunit/phpunit": "^8.2.2"
             },
             "suggest": {
-                "ext-xdebug": "^2.5.5"
+                "ext-xdebug": "^2.7.2"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "5.3.x-dev"
+                    "dev-master": "7.0-dev"
                 }
             },
             "autoload": {
@@ -486,29 +486,32 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2018-04-06T15:36:58+00:00"
+            "time": "2019-11-20T13:55:58+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
-            "version": "1.4.5",
+            "version": "2.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
-                "reference": "730b01bc3e867237eaac355e06a36b85dd93a8b4"
+                "reference": "050bedf145a257b1ff02746c31894800e5122946"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/730b01bc3e867237eaac355e06a36b85dd93a8b4",
-                "reference": "730b01bc3e867237eaac355e06a36b85dd93a8b4",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/050bedf145a257b1ff02746c31894800e5122946",
+                "reference": "050bedf145a257b1ff02746c31894800e5122946",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3"
+                "php": "^7.1"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^7.1"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.4.x-dev"
+                    "dev-master": "2.0.x-dev"
                 }
             },
             "autoload": {
@@ -523,7 +526,7 @@
             "authors": [
                 {
                     "name": "Sebastian Bergmann",
-                    "email": "sb@sebastian-bergmann.de",
+                    "email": "sebastian@phpunit.de",
                     "role": "lead"
                 }
             ],
@@ -533,7 +536,7 @@
                 "filesystem",
                 "iterator"
             ],
-            "time": "2017-11-27T13:52:08+00:00"
+            "time": "2018-09-13T20:33:42+00:00"
         },
         {
             "name": "phpunit/php-text-template",
@@ -578,28 +581,28 @@
         },
         {
             "name": "phpunit/php-timer",
-            "version": "1.0.9",
+            "version": "2.1.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-timer.git",
-                "reference": "3dcf38ca72b158baf0bc245e9184d3fdffa9c46f"
+                "reference": "1038454804406b0b5f5f520358e78c1c2f71501e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/3dcf38ca72b158baf0bc245e9184d3fdffa9c46f",
-                "reference": "3dcf38ca72b158baf0bc245e9184d3fdffa9c46f",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/1038454804406b0b5f5f520358e78c1c2f71501e",
+                "reference": "1038454804406b0b5f5f520358e78c1c2f71501e",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.3 || ^7.0"
+                "php": "^7.1"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.0"
+                "phpunit/phpunit": "^7.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0-dev"
+                    "dev-master": "2.1-dev"
                 }
             },
             "autoload": {
@@ -614,7 +617,7 @@
             "authors": [
                 {
                     "name": "Sebastian Bergmann",
-                    "email": "sb@sebastian-bergmann.de",
+                    "email": "sebastian@phpunit.de",
                     "role": "lead"
                 }
             ],
@@ -623,33 +626,33 @@
             "keywords": [
                 "timer"
             ],
-            "time": "2017-02-26T11:10:40+00:00"
+            "time": "2019-06-07T04:22:29+00:00"
         },
         {
             "name": "phpunit/php-token-stream",
-            "version": "2.0.2",
+            "version": "3.1.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-token-stream.git",
-                "reference": "791198a2c6254db10131eecfe8c06670700904db"
+                "reference": "995192df77f63a59e47f025390d2d1fdf8f425ff"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-token-stream/zipball/791198a2c6254db10131eecfe8c06670700904db",
-                "reference": "791198a2c6254db10131eecfe8c06670700904db",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-token-stream/zipball/995192df77f63a59e47f025390d2d1fdf8f425ff",
+                "reference": "995192df77f63a59e47f025390d2d1fdf8f425ff",
                 "shasum": ""
             },
             "require": {
                 "ext-tokenizer": "*",
-                "php": "^7.0"
+                "php": "^7.1"
             },
             "require-dev": {
-                "phpunit/phpunit": "^6.2.4"
+                "phpunit/phpunit": "^7.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.0-dev"
+                    "dev-master": "3.1-dev"
                 }
             },
             "autoload": {
@@ -672,57 +675,56 @@
             "keywords": [
                 "tokenizer"
             ],
-            "time": "2017-11-27T05:48:46+00:00"
+            "time": "2019-09-17T06:23:10+00:00"
         },
         {
             "name": "phpunit/phpunit",
-            "version": "6.5.14",
+            "version": "8.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "bac23fe7ff13dbdb461481f706f0e9fe746334b7"
+                "reference": "3ee1c1fd6fc264480c25b6fb8285edefe1702dab"
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             "dist": {
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-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/bac23fe7ff13dbdb461481f706f0e9fe746334b7",
-                "reference": "bac23fe7ff13dbdb461481f706f0e9fe746334b7",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/3ee1c1fd6fc264480c25b6fb8285edefe1702dab",
+                "reference": "3ee1c1fd6fc264480c25b6fb8285edefe1702dab",
                 "shasum": ""
             },
             "require": {
+                "doctrine/instantiator": "^1.2.0",
                 "ext-dom": "*",
                 "ext-json": "*",
                 "ext-libxml": "*",
                 "ext-mbstring": "*",
                 "ext-xml": "*",
-                "myclabs/deep-copy": "^1.6.1",
-                "phar-io/manifest": "^1.0.1",
-                "phar-io/version": "^1.0",
-                "php": "^7.0",
-                "phpspec/prophecy": "^1.7",
-                "phpunit/php-code-coverage": "^5.3",
-                "phpunit/php-file-iterator": "^1.4.3",
+                "ext-xmlwriter": "*",
+                "myclabs/deep-copy": "^1.9.1",
+                "phar-io/manifest": "^1.0.3",
+                "phar-io/version": "^2.0.1",
+                "php": "^7.2",
+                "phpspec/prophecy": "^1.8.1",
+                "phpunit/php-code-coverage": "^7.0.7",
+                "phpunit/php-file-iterator": "^2.0.2",
                 "phpunit/php-text-template": "^1.2.1",
-                "phpunit/php-timer": "^1.0.9",
-                "phpunit/phpunit-mock-objects": "^5.0.9",
-                "sebastian/comparator": "^2.1",
-                "sebastian/diff": "^2.0",
-                "sebastian/environment": "^3.1",
-                "sebastian/exporter": "^3.1",
-                "sebastian/global-state": "^2.0",
+                "phpunit/php-timer": "^2.1.2",
+                "sebastian/comparator": "^3.0.2",
+                "sebastian/diff": "^3.0.2",
+                "sebastian/environment": "^4.2.2",
+                "sebastian/exporter": "^3.1.1",
+                "sebastian/global-state": "^3.0.0",
                 "sebastian/object-enumerator": "^3.0.3",
-                "sebastian/resource-operations": "^1.0",
+                "sebastian/resource-operations": "^2.0.1",
+                "sebastian/type": "^1.1.3",
                 "sebastian/version": "^2.0.1"
             },
-            "conflict": {
-                "phpdocumentor/reflection-docblock": "3.0.2",
-                "phpunit/dbunit": "<3.0"
-            },
             "require-dev": {
                 "ext-pdo": "*"
             },
             "suggest": {
+                "ext-soap": "*",
                 "ext-xdebug": "*",
-                "phpunit/php-invoker": "^1.1"
+                "phpunit/php-invoker": "^2.0.0"
             },
             "bin": [
                 "phpunit"
@@ -730,7 +732,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "6.5.x-dev"
+                    "dev-master": "8.5-dev"
                 }
             },
             "autoload": {
@@ -756,67 +758,7 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2019-02-01T05:22:47+00:00"
-        },
-        {
-            "name": "phpunit/phpunit-mock-objects",
-            "version": "5.0.10",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/sebastianbergmann/phpunit-mock-objects.git",
-                "reference": "cd1cf05c553ecfec36b170070573e540b67d3f1f"
-            },
-            "dist": {
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-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit-mock-objects/zipball/cd1cf05c553ecfec36b170070573e540b67d3f1f",
-                "reference": "cd1cf05c553ecfec36b170070573e540b67d3f1f",
-                "shasum": ""
-            },
-            "require": {
-                "doctrine/instantiator": "^1.0.5",
-                "php": "^7.0",
-                "phpunit/php-text-template": "^1.2.1",
-                "sebastian/exporter": "^3.1"
-            },
-            "conflict": {
-                "phpunit/phpunit": "<6.0"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^6.5.11"
-            },
-            "suggest": {
-                "ext-soap": "*"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "5.0.x-dev"
-                }
-            },
-            "autoload": {
-                "classmap": [
-                    "src/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de",
-                    "role": "lead"
-                }
-            ],
-            "description": "Mock Object library for PHPUnit",
-            "homepage": "https://github.com/sebastianbergmann/phpunit-mock-objects/",
-            "keywords": [
-                "mock",
-                "xunit"
-            ],
-            "abandoned": true,
-            "time": "2018-08-09T05:50:03+00:00"
+            "time": "2019-12-06T05:41:38+00:00"
         },
         {
             "name": "sebastian/code-unit-reverse-lookup",
@@ -865,30 +807,30 @@
         },
         {
             "name": "sebastian/comparator",
-            "version": "2.1.3",
+            "version": "3.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/comparator.git",
-                "reference": "34369daee48eafb2651bea869b4b15d75ccc35f9"
+                "reference": "5de4fc177adf9bce8df98d8d141a7559d7ccf6da"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/comparator/zipball/34369daee48eafb2651bea869b4b15d75ccc35f9",
-                "reference": "34369daee48eafb2651bea869b4b15d75ccc35f9",
+                "url": "https://api.github.com/repos/sebastianbergmann/comparator/zipball/5de4fc177adf9bce8df98d8d141a7559d7ccf6da",
+                "reference": "5de4fc177adf9bce8df98d8d141a7559d7ccf6da",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.0",
-                "sebastian/diff": "^2.0 || ^3.0",
+                "php": "^7.1",
+                "sebastian/diff": "^3.0",
                 "sebastian/exporter": "^3.1"
             },
             "require-dev": {
-                "phpunit/phpunit": "^6.4"
+                "phpunit/phpunit": "^7.1"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.1.x-dev"
+                    "dev-master": "3.0-dev"
                 }
             },
             "autoload": {
@@ -925,32 +867,33 @@
                 "compare",
                 "equality"
             ],
-            "time": "2018-02-01T13:46:46+00:00"
+            "time": "2018-07-12T15:12:46+00:00"
         },
         {
             "name": "sebastian/diff",
-            "version": "2.0.1",
+            "version": "3.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/diff.git",
-                "reference": "347c1d8b49c5c3ee30c7040ea6fc446790e6bddd"
+                "reference": "720fcc7e9b5cf384ea68d9d930d480907a0c1a29"
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             "dist": {
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-                "url": "https://api.github.com/repos/sebastianbergmann/diff/zipball/347c1d8b49c5c3ee30c7040ea6fc446790e6bddd",
-                "reference": "347c1d8b49c5c3ee30c7040ea6fc446790e6bddd",
+                "url": "https://api.github.com/repos/sebastianbergmann/diff/zipball/720fcc7e9b5cf384ea68d9d930d480907a0c1a29",
+                "reference": "720fcc7e9b5cf384ea68d9d930d480907a0c1a29",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.0"
+                "php": "^7.1"
             },
             "require-dev": {
-                "phpunit/phpunit": "^6.2"
+                "phpunit/phpunit": "^7.5 || ^8.0",
+                "symfony/process": "^2 || ^3.3 || ^4"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.0-dev"
+                    "dev-master": "3.0-dev"
                 }
             },
             "autoload": {
@@ -975,34 +918,40 @@
             "description": "Diff implementation",
             "homepage": "https://github.com/sebastianbergmann/diff",
             "keywords": [
-                "diff"
+                "diff",
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+                "unidiff",
+                "unified diff"
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-            "time": "2017-08-03T08:09:46+00:00"
+            "time": "2019-02-04T06:01:07+00:00"
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-            "version": "3.1.0",
+            "version": "4.2.3",
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                 "url": "https://github.com/sebastianbergmann/environment.git",
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+                "php": "^7.1"
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+                "phpunit/phpunit": "^7.5"
+            },
+            "suggest": {
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+                    "dev-master": "4.2-dev"
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@@ -1027,7 +976,7 @@
                 "environment",
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-            "time": "2017-07-01T08:51:00+00:00"
+            "time": "2019-11-20T08:46:58+00:00"
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@@ -1098,23 +1047,26 @@
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+                "php": "^7.2",
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-                "phpunit/phpunit": "^6.0"
+                "ext-dom": "*",
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@@ -1122,7 +1074,7 @@
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+                    "dev-master": "3.0-dev"
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@@ -1145,7 +1097,7 @@
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             ],
-            "time": "2017-04-27T15:39:26+00:00"
+            "time": "2019-02-01T05:30:01+00:00"
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@@ -1294,25 +1246,25 @@
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+            "version": "2.0.1",
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                 "url": "https://github.com/sebastianbergmann/resource-operations.git",
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+                "php": "^7.1"
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-                    "dev-master": "1.0.x-dev"
+                    "dev-master": "2.0-dev"
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@@ -1332,7 +1284,53 @@
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             "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
-            "time": "2015-07-28T20:34:47+00:00"
+            "time": "2018-10-04T04:07:39+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "1.1.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "3aaaa15fa71d27650d62a948be022fe3b48541a3"
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+                "reference": "3aaaa15fa71d27650d62a948be022fe3b48541a3",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2"
+            },
+            "require-dev": {
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+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
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+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Collection of value objects that represent the types of the PHP type system",
+            "homepage": "https://github.com/sebastianbergmann/type",
+            "time": "2019-07-02T08:10:15+00:00"
         },
         {
             "name": "sebastian/version",