Changed the node type for the key named "key"

Author: sebprt

src/Configuration/Parameters.php

@@ -4,6 +4,7 @@
 
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
 use Symfony\Component\Config\Definition\ConfigurationInterface;
+use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
 use function Kiboko\Component\SatelliteToolbox\Configuration\asExpression;
 use function Kiboko\Component\SatelliteToolbox\Configuration\isExpression;
 
@@ -23,12 +24,18 @@ public function getConfigTreeBuilder()
             ->end()
             ->arrayPrototype()
                 ->children()
-                    ->scalarNode('key')
+                    ->variableNode('key')
                         ->isRequired()
                         ->validate()
                             ->ifTrue(isExpression())
                             ->then(asExpression())
                         ->end()
+                        ->validate()
+                            ->ifTrue(function ($value) {
+                                return !is_string($value) && !is_int($value);
+                            })
+                            ->thenInvalid('The parameter\'s key must be of a string or an integer.')
+                        ->end()
                     ->end()
                     ->scalarNode('value')
                         ->isRequired()