diff --git a/.gitattributes b/.gitattributes
index 1a0dbd9e..71ea87ab 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,13 +1,11 @@
 .github/ export-ignore
-.phan/ export-ignore
 docs/ export-ignore
 Tests/ export-ignore
-.drone.jsonnet export-ignore
-.drone.yml export-ignore
 .editorconfig export-ignore
 .gitattributes export-ignore
 .gitignore export-ignore
 .phpunit.cache export-ignore
 phpunit.xml.dist export-ignore
-rector.php export-ignore
 ruleset.xml export-ignore
+phpstan.neon export-ignore
+phpstan-baseline.neon export-ignore
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
new file mode 100644
index 00000000..7b1994c3
--- /dev/null
+++ b/phpstan-baseline.neon
@@ -0,0 +1,19 @@
+parameters:
+	ignoreErrors:
+		-
+			message: '#^Call to function is_int\(\) with int will always evaluate to true\.$#'
+			identifier: function.alreadyNarrowedType
+			count: 1
+			path: src/AbstractWebApplication.php
+
+		-
+			message: '#^Instanceof between DateTime and DateTime will always evaluate to true\.$#'
+			identifier: instanceof.alwaysTrue
+			count: 1
+			path: src/AbstractWebApplication.php
+
+		-
+			message: '#^Result of && is always false\.$#'
+			identifier: booleanAnd.alwaysFalse
+			count: 1
+			path: src/AbstractWebApplication.php
diff --git a/phpstan.neon b/phpstan.neon
index 07d82270..305d72f1 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,6 +1,7 @@
 
 includes:
 	- vendor/phpstan/phpstan-deprecation-rules/rules.neon
+	- phpstan-baseline.neon
 
 parameters:
 	level: 5
diff --git a/src/AbstractWebApplication.php b/src/AbstractWebApplication.php
index 23464c00..0f325601 100644
--- a/src/AbstractWebApplication.php
+++ b/src/AbstractWebApplication.php
@@ -321,7 +321,7 @@ protected function compress()
 
         // Iterate through the encodings and attempt to compress the data using any found supported encodings.
         foreach ($encodings as $encoding) {
-            if (($supported[$encoding] == 'gz') || ($supported[$encoding] == 'deflate')) {
+            if (in_array($supported[$encoding], ['gz', 'deflate'])) {
                 // Verify that the server supports gzip compression before we attempt to gzip encode the data.
                 // @codeCoverageIgnoreStart
                 if (!\extension_loaded('zlib') || \ini_get('zlib.output_compression')) {