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diff --git a/vendor/consolidation/config/src/Util/ConfigFallback.php b/vendor/consolidation/config/src/Util/ConfigFallback.php
new file mode 100644
index 000000000..9f9972f60
--- /dev/null
+++ b/vendor/consolidation/config/src/Util/ConfigFallback.php
@@ -0,0 +1,51 @@
+<?php
+namespace Consolidation\Config\Util;
+
+/**
+ * Fetch a configuration value from a configuration group. If the
+ * desired configuration value is not found in the most specific
+ * group named, keep stepping up to the next parent group until a
+ * value is located.
+ *
+ * Given the following constructor inputs:
+ *   - $prefix  = "command."
+ *   - $group   = "foo.bar.baz"
+ *   - $postfix = ".options."
+ * Then the `get` method will then consider, in order:
+ *   - command.foo.bar.baz.options
+ *   - command.foo.bar.options
+ *   - command.foo.options
+ * If any of these contain an option for "$key", then return its value.
+ */
+class ConfigFallback extends ConfigGroup
+{
+    /**
+     * @inheritdoc
+     */
+    public function get($key)
+    {
+        return $this->getWithFallback($key, $this->group, $this->prefix, $this->postfix);
+    }
+
+    /**
+     * Fetch an option value from a given key, or, if that specific key does
+     * not contain a value, then consult various fallback options until a
+     * value is found.
+     *
+     */
+    protected function getWithFallback($key, $group, $prefix = '', $postfix = '.')
+    {
+        $configKey = "{$prefix}{$group}${postfix}{$key}";
+        if ($this->config->has($configKey)) {
+            return $this->config->get($configKey);
+        }
+        if ($this->config->hasDefault($configKey)) {
+            return $this->config->getDefault($configKey);
+        }
+        $moreGeneralGroupname = $this->moreGeneralGroupName($group);
+        if ($moreGeneralGroupname) {
+            return $this->getWithFallback($key, $moreGeneralGroupname, $prefix, $postfix);
+        }
+        return null;
+    }
+}