diff --git a/lib/dao.js b/lib/dao.js
index ef59eaea..221adbec 100644
--- a/lib/dao.js
+++ b/lib/dao.js
@@ -380,7 +380,15 @@ DataAccessObject.create = function(data, options, cb) {
       obj.trigger('save', function(saveDone) {
         const _idName = idName(Model);
         let val = Model._sanitizeData(obj.toObject(true), options);
-        function createCallback(err, id, rev) {
+
+        // SPIKE: changed the signature
+        function createCallback(options) {
+
+          const { err, id, rev, propertyCoercer } = options;
+
+          // SPIKE: apply coercion
+          propertyCoercer(obj.__data, Model.definition.properties);
+
           if (id) {
             obj.__data[_idName] = id;
             defineReadonlyProp(obj, _idName, id);
@@ -1628,7 +1636,7 @@ DataAccessObject.find = function find(query, options, cb) {
         } else {
           withNotify(item, next);
         }
-
+        
         function buildResult(data, callback) {
           const ctorOpts = {
             fields: query.fields,
@@ -1636,10 +1644,20 @@ DataAccessObject.find = function find(query, options, cb) {
             persisted: true,
             // see https://github.com/strongloop/loopback-datasource-juggler/issues/1692
             applyDefaultValues: false,
+            // SPIKE: applyDefaultIdType to control reconversion to default type
           };
           let obj;
           try {
+            // SPIKE: This converts string-id back to ObjectID
             obj = new Model(data, ctorOpts);
+
+const propDefs = self.dataSource.definitions[self.modelName].properties;
+if (propDefs.id.type.name === 'ObjectID') {
+  // SPIKE: to change the constructor type
+  const strId = new String(obj.id.toString());
+  obj.id = strId;
+}
+
           } catch (err) {
             return callback(err);
           }
@@ -2723,6 +2741,9 @@ DataAccessObject.replaceById = function(id, data, options, cb) {
             ctx.data[pkName] = id;
             inst.setAttributes(ctx.data);
 
+            // SPIKE: any attempt to change the id before this will not work
+            inst.id = new String(inst.id);
+
             const context = {
               Model: Model,
               instance: inst,