Die when setting multiple fields with multiple plugin_keyword values

lib/Dancer2/Plugin.pm

@@ -342,8 +342,17 @@ sub _exporter_plugin {
             our \@EXPORT = ( ':app' );
 
             around has => sub {
-                my( \$orig, \$name, \@args ) = \@_;
-                \$orig->( ${caller}->_p2_has( \$_, \@args) )
+                my( \$orig, \$name, \%args ) = \@_;
+
+                if (ref \$name eq 'ARRAY'
+                        && exists \$args{'plugin_keyword'}
+                        && ref \$args{'plugin_keyword'} eq 'ARRAY') {
+
+                    Carp::croak('Setting "plugin_keyword" to an array is disallowed'
+                        . ' when defining multiple attributes simultaneously');
+                }
+
+                \$orig->( ${caller}->_p2_has( \$_, \%args) )
                     for ref \$name ? @\$name : \$name;
             };
 
@@ -818,8 +827,6 @@ You can also turn an attribute of the plugin into a keyword.
         plugin_keyword => [ 'baz', 'bazz' ],  # keywords will be 'baz' and 'bazz'
     );
 
-
-
 =head3 Accessing the plugin configuration
 
 The plugin configuration is available via the C<config()> method.

t/plugin2/from-config.t

@@ -1,7 +1,7 @@
 use strict;
 use warnings;
 
-use Test::More tests => 7;
+use Test::More tests => 8;
 
 {
 package Dancer2::Plugin::FromConfig;
@@ -43,6 +43,15 @@ has [qw(seven eight)] => (
     plugin_keyword => 1,
 );
 
+eval {
+    has [qw(nine ten)] => (
+        is => 'ro',
+        from_config => 1,
+        plugin_keyword => ['nine', 'ten'],
+    );
+};
+our $plugin_keyword_exception = $@;
+
 plugin_keywords qw/ one three four five /;
 
 }
@@ -74,6 +83,9 @@ plugin_keywords qw/ one three four five /;
     Test::More::is six() => 'AH!', 'from_config a coderef, no override';
     Test::More::is seven() => 'sept', 'from_config, defined two fields at once #1';
     Test::More::is eight() => 'huit', 'from_config, defined two fields at once #2';
+    Test::More::ok $Dancer2::Plugin::FromConfig::plugin_keyword_exception,
+        "defining two fields simultaneously with multiple plugin_keyword values"
+        . " is disallowed";
 }