$ diff lib.php libt.php -u
--- lib.php     2020-11-07 17:45:07.080471992 +0800
+++ libt.php    2020-11-12 01:50:39.854292981 +0800
@@ -374,9 +374,9 @@
     // Sort candidates by maturity desc (stable first, alpha last).
     krsort($candidates, SORT_NUMERIC);

-    // Within each maturity, sort by branch desc (3.0 before 2.9).
+    // Within each maturity, sort by branch desc (3.0 before 2.9, 3.10 before 3.9).
     foreach (array_keys($candidates) as $maturity) {
-        krsort($candidates[$maturity], SORT_NUMERIC);
+        krsort($candidates[$maturity], SORT_NATURAL);
     }

     // Attempt to find the most mature version. Note that we are preferring
@@ -389,7 +389,7 @@

     // First try to find in the requested branch or lower.
     foreach ($finalists as $supportedbranch => $version) {
-        if ((double)$supportedbranch > $targetbranch) {
+        if (version_compare($supportedbranch, $targetbranch, '>')) {
             continue;
         } else {
             return $version;