Fix Time\Duration polyfill public API implementation

Author: nyamsprod

src/Time/Resources/stubs/Time/Duration.php

@@ -176,7 +176,7 @@ public static function fromHours(int $hours): self
          * Parse a ISO-8601 period. ISO-8601 periods with a date component will be rejected.
          * The biggest allowed component is H.
          */
-        public static function fromIso8601String(string $specification): self
+        public static function fromIso8601DurationString(string $specification): self
         {
             if (preg_match(self::REGEXP_ISO8601, $specification, $parts) !== 1) {
                 throw new TimeException("The submitted duration `$specification` is invalid or contains unsupported ISO 8601 duration components.");
@@ -210,6 +210,15 @@ public function negate(): self
             return new self($this->seconds, $this->nanoseconds, !$this->negative);
         }
 
+        public function absolute(): self
+        {
+            if ($this->negative === true) {
+                return $this->negate();
+            }
+
+            return $this;
+        }
+
         /**
          * Add the given duration to the duration.
          *

tests/Time/DurationTest.php

@@ -132,7 +132,7 @@ public function testParseIso8601(
         int $nanoseconds,
         bool $negative
     ) {
-        $duration = Duration::fromIso8601String($spec);
+        $duration = Duration::fromIso8601DurationString($spec);
 
         $this->assertSame($seconds, $duration->seconds);
         $this->assertSame($nanoseconds, $duration->nanoseconds);
@@ -162,7 +162,7 @@ public function testRejectInvalidIso8601(string $spec)
     {
         $this->expectException(TimeException::class);
 
-        Duration::fromIso8601String($spec);
+        Duration::fromIso8601DurationString($spec);
     }
 
     /**
@@ -349,7 +349,7 @@ public function testItRejectsInvalidIso8601Durations(string $specification)
     {
         $this->expectException(TimeException::class);
 
-        Duration::fromIso8601String($specification);
+        Duration::fromIso8601DurationString($specification);
     }
 
     /**