Minor fixes following to PR discussion

lib/data-types.js

@@ -410,7 +410,7 @@ var pgRangeSubtypes = {
 
 RANGE.prototype.key = RANGE.key = 'RANGE';
 RANGE.prototype.toSql = function() {
-  return pgRangeSubtypes[this._subtype.toLowerCase()] || pgRangeSubtypes['integer'];
+  return pgRangeSubtypes[this._subtype.toLowerCase()];
 };
 
 /**
@@ -510,7 +510,7 @@ ENUM.prototype.key = ENUM.key = 'ENUM';
  * @property ARRAY
  */
 var ARRAY = function(type) {
-  var options = _.isPlainObject(type) && !(type instanceof ABSTRACT) && type || {
+  var options = _.isPlainObject(type) ? type : {
     type: type
   };
   if (!(this instanceof ARRAY)) return new ARRAY(options);

test/integration/dialects/postgres/error.test.js

@@ -55,16 +55,12 @@ if (dialect.match(/^postgres/)) {
           period:    [new Date(2015, 0, 1), new Date(2015, 0, 3)]
         })
         .then(function () {
-          return Booking
+          return expect(Booking
             .create({
               roomNo:    1,
               guestName: 'Frequent Visitor',
               period:    [new Date(2015, 0, 2), new Date(2015, 0, 5)]
-            })
-            .done(function (err) {
-              expect(!!err).to.be.ok;
-              expect(err instanceof Sequelize.ExclusionConstraintError).to.be.ok;
-            });
+            })).to.eventually.be.rejectedWith(Sequelize.ExclusionConstraintError);
         });
     });