diff --git a/CHANGELOG.md b/CHANGELOG.md
index e3aa7db1..3ef217d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,7 +18,7 @@ Please also have a look at our
 
 ### Fixed
 
-- Use typesafe versions of PHP functions (#1368)
+- Use typesafe versions of PHP functions (#1368, #1370)
 
 ### Documentation
 
diff --git a/src/Parsing/ParserState.php b/src/Parsing/ParserState.php
index 74ad0efe..cc69ed97 100644
--- a/src/Parsing/ParserState.php
+++ b/src/Parsing/ParserState.php
@@ -7,6 +7,10 @@
 use Sabberworm\CSS\Comment\Comment;
 use Sabberworm\CSS\Settings;
 
+use function Safe\iconv;
+use function Safe\preg_match;
+use function Safe\preg_split;
+
 /**
  * @internal since 8.7.0
  */
@@ -63,8 +67,6 @@ public function __construct(string $text, Settings $parserSettings, int $lineNum
 
     /**
      * Sets the charset to be used if the CSS does not contain an `@charset` declaration.
-     *
-     * @throws SourceException if the charset is UTF-8 and the content has invalid byte sequences
      */
     public function setCharset(string $charset): void
     {
@@ -122,7 +124,7 @@ public function parseIdentifier(bool $ignoreCase = true): string
         }
         $character = null;
         while (!$this->isEnd() && ($character = $this->parseCharacter(true)) !== null) {
-            if (\preg_match('/[a-zA-Z0-9\\x{00A0}-\\x{FFFF}_-]/Sux', $character)) {
+            if (preg_match('/[a-zA-Z0-9\\x{00A0}-\\x{FFFF}_-]/Sux', $character) !== 0) {
                 $result .= $character;
             } else {
                 $result .= '\\' . $character;
@@ -146,13 +148,13 @@ public function parseCharacter(bool $isForIdentifier): ?string
             if ($this->comes('\\n') || $this->comes('\\r')) {
                 return '';
             }
-            if (\preg_match('/[0-9a-fA-F]/Su', $this->peek()) === 0) {
+            if (preg_match('/[0-9a-fA-F]/Su', $this->peek()) === 0) {
                 return $this->consume(1);
             }
             $hexCodePoint = $this->consumeExpression('/^[0-9a-fA-F]{1,6}/u', 6);
             if ($this->strlen($hexCodePoint) < 6) {
                 // Consume whitespace after incomplete unicode escape
-                if (\preg_match('/\\s/isSu', $this->peek())) {
+                if (preg_match('/\\s/isSu', $this->peek()) !== 0) {
                     if ($this->comes('\\r\\n')) {
                         $this->consume(2);
                     } else {
@@ -166,7 +168,7 @@ public function parseCharacter(bool $isForIdentifier): ?string
                 $utf32EncodedCharacter .= \chr($codePoint & 0xff);
                 $codePoint = $codePoint >> 8;
             }
-            return \iconv('utf-32le', $this->charset, $utf32EncodedCharacter);
+            return iconv('utf-32le', $this->charset, $utf32EncodedCharacter);
         }
         if ($isForIdentifier) {
             $peek = \ord($this->peek());
@@ -198,7 +200,7 @@ public function consumeWhiteSpace(): array
     {
         $comments = [];
         do {
-            while (\preg_match('/\\s/isSu', $this->peek()) === 1) {
+            while (preg_match('/\\s/isSu', $this->peek()) === 1) {
                 $this->consume(1);
             }
             if ($this->parserSettings->usesLenientParsing()) {
@@ -291,7 +293,7 @@ public function consumeExpression(string $expression, ?int $maximumLength = null
     {
         $matches = null;
         $input = ($maximumLength !== null) ? $this->peek($maximumLength) : $this->inputLeft();
-        if (\preg_match($expression, $input, $matches, PREG_OFFSET_CAPTURE) !== 1) {
+        if (preg_match($expression, $input, $matches, PREG_OFFSET_CAPTURE) !== 1) {
             throw new UnexpectedTokenException($expression, $this->peek(5), 'expression', $this->lineNumber);
         }
 
@@ -437,17 +439,12 @@ private function strtolower(string $string): string
 
     /**
      * @return list<string>
-     *
-     * @throws SourceException if the charset is UTF-8 and the string contains invalid byte sequences
      */
     private function strsplit(string $string): array
     {
         if ($this->parserSettings->hasMultibyteSupport()) {
             if ($this->streql($this->charset, 'utf-8')) {
-                $result = \preg_split('//u', $string, -1, PREG_SPLIT_NO_EMPTY);
-                if (!\is_array($result)) {
-                    throw new SourceException('`preg_split` failed with error ' . \preg_last_error());
-                }
+                $result = preg_split('//u', $string, -1, PREG_SPLIT_NO_EMPTY);
             } else {
                 $length = \mb_strlen($string, $this->charset);
                 $result = [];