Bug-fix.

Changelog excerpt:
- Aggregating a single IP address with its own CIDR equivalent (i.e., a
  range containing just one IP address) produced output with a wider than
  expected range; Fixed.

Changelog.txt

@@ -9,6 +9,16 @@ Versioning guidelines for SemVer can be found at: https://semver.org/
 
 (none)
 
+=== Version/Release 1.3.3 ===
+PATCH RELEASE.
+
+- [2021.10.23; Bug-fix; Maikuolan]: Aggregating a single IP address with its
+  own CIDR equivalent (i.e., a range containing just one IP address) produced
+  output with a wider than expected range; Fixed.
+
+Caleb M (Maikuolan),
+October 23, 2021.
+
 === Version/Release 1.3.2 ===
 MAINTENANCE RELEASE.
 

src/Aggregator.php

@@ -509,7 +509,9 @@ private function mergeRanges(&$In)
                 if (!$CIDRs = $this->ExpandIPv4($CIDR, false, $Size - 1)) {
                     $CIDRs = $this->ExpandIPv6($CIDR, false, $Size - 1);
                 }
-                if (
+                if ($Line === $PrevLine) {
+                    $Out = str_replace("\n" . $PrevLine . "\n" . $Line . "\n", "\n" . $Line . "\n", $Out);
+                } elseif (
                     !empty($CIDRs[$Size - 1]) &&
                     !empty($PrevCIDRs[$PrevSize - 1]) &&
                     !empty($CIDRs[$Size - 2]) &&

tests.php

@@ -140,5 +140,19 @@
     }
 }
 
+$TestInput = '1.0.0.0/32
+1.0.0.0';
+
+$ExpectedOutput = '1.0.0.0/32';
+
+$Aggregator = new \CIDRAM\Aggregator\Aggregator();
+$Aggregator->Results = true;
+$Aggregated = $Aggregator->aggregate($TestInput);
+
+if ($ExpectedOutput !== $Aggregated) {
+    echo 'Output is bugged.' . PHP_EOL;
+    exit(5);
+}
+
 echo 'All tests passed.' . PHP_EOL;
 exit(0);