Merge pull request #2187 from jchbh-duplicate/master

Fix an bug: Boolean always return true in mysql when column define has attributes of ZeroFill and Unsigned.

lib/instance.js

@@ -316,7 +316,7 @@ module.exports = (function() {
               // Bit fields are returned as buffers
               value = value[0];
             }
-            value = !!value;
+            value = _.isString(value) ? !!parseInt(value) : !!value;
           }
 
           if (!options.raw && originalValue !== value) {