Fix implementation of _STRINGLIKE0

This was checking for string overloading but only considered that valid if it
returned a non-zero length string, even though for plain old strings, an empty
string was accepted.

In practice, this didn't matter, because if this check failed, it would just
check to see if "$_[0] eq q{}", which stringified the object.

diff --git a/lib/Moose/Util.pm b/lib/Moose/Util.pm
index 8b4c34f..09803d4 100644 (file)
--- a/lib/Moose/Util.pm
+++ b/lib/Moose/Util.pm
@@ -308,12 +308,14 @@ sub meta_class_alias {
 
 # XXX - this should be added to Params::Util
 sub _STRINGLIKE0 ($) {
-    return _STRING( $_[0] )
-        || ( defined $_[0]
-        && $_[0] eq q{} )
-        || ( blessed $_[0]
-        && overload::Method( $_[0], q{""} )
-        && length "$_[0]" );
+    return 1 if _STRING( $_[0] );
+    if ( blessed $_[0] ) {
+        return overload::Method( $_[0], q{""} );
+    }
+
+    return 1 if defined $_[0] && $_[0] eq q{};
+
+    return 0;
 }
 
 sub _reconcile_roles_for_metaclass {