Upstream thephpleague/uri-src state of the touched files before 3ad4f269f2

uri/UriTemplate/Operator.php

@@ -19,10 +19,10 @@ use Stringable;
 
 use function implode;
 use function is_array;
-use function mb_substr;
 use function preg_match;
 use function rawurlencode;
 use function str_contains;
+use function substr;
 
 /**
  * Processing behavior according to the expression type operator.
@@ -156,9 +156,7 @@ enum Operator: string
         }
 
         if (':' === $varSpec->modifier) {
-            // RFC 6570 Section 2.4.1: the prefix length is a count of characters, not octets,
-            // so a multibyte-aware truncation is required to avoid splitting a UTF-8 character.
-            $value = mb_substr($value, 0, $varSpec->position, 'UTF-8');
+            $value = substr($value, 0, $varSpec->position);
         }
 
         return [$this->decode($value), $this->isNamed()];