diff --git a/src/dataset.js b/src/dataset.js
index 130beee..6da1f32 100644
--- a/src/dataset.js
+++ b/src/dataset.js
@@ -483,7 +483,7 @@ Version 0.0.1.2
       // don't attempt tp remove the rows while iterating over them
       // since that modifies the length of the dataset and thus
       // terminates the each loop early. 
-      _.each(rowsToRemove, function(rowId) {
+      _.each(rowsToRemove.reverse(), function(rowId) {
         this._remove(rowId);  
       }, this);
       
diff --git a/src/types.js b/src/types.js
index 8892c94..6ef08e8 100644
--- a/src/types.js
+++ b/src/types.js
@@ -109,7 +109,7 @@
 
     number : {  
       name : "number",
-      regexp : /^\s*[\-\.]?[0-9]+([\.][0-9]+)?\s*$/,
+      regexp : /^\s*[\-\.]?[0-9]+([\.][0-9]+)?([eE]\-?\d+)?\s*$/,
       coerce : function(v) {
         var cv = +v;
         if (_.isNull(v) || typeof v === "undefined" || _.isNaN(cv)) {
diff --git a/src/view.js b/src/view.js
index adeacf5..7c8c092 100644
--- a/src/view.js
+++ b/src/view.js
@@ -200,7 +200,7 @@
           // existing row to update and now need to just add a new
           // one. Use the delta's changed properties as the new row
           // if it passes the filter.
-          if (this.filter.rows && this.filter.rows(d.changed)) {
+          if (this.filter.rows && this.filter.rows(d.changed)){
             this._add(d.changed);  
             eventType = "add";
           }
@@ -519,6 +519,11 @@
       _.each(row, function(value, key) {
         var column = this.column(key);
 
+        //tried to catch that at the _synv function 
+        if(typeof column === 'undefined'){
+          return;
+        }
+
         // is this a computed column? if so throw an error
         if (column.isComputed()) {
           throw "You're trying to update a computed column. Those get computed!";
diff --git a/test/unit/dataset.js b/test/unit/dataset.js
index 6ef950b..7664ab0 100644
--- a/test/unit/dataset.js
+++ b/test/unit/dataset.js
@@ -75,6 +75,26 @@
     ok( ds._rowIdByPosition[0] !== firstRowId );
     equals(ds.length, 2);
   });
+  
+  
+   test("removing multiple rows with a function", function() {
+    // this was failing before the rows were not reverse before removing
+    // removing the two first line was indeed removing the first and 3rd
+    var ds = Util.baseSample();
+    var firstRowId = ds._rowIdByPosition[0];
+    var secondRowId = ds._rowIdByPosition[1];
+    
+    equals(ds.length, 3);
+    ds.remove(function(row) { return (row.one <= 2); });
+    
+    strictEqual( ds._rowPositionById[firstRowId], undefined );
+    strictEqual( ds._rowPositionById[secondRowId], undefined );
+    
+    equals(ds.length, 1);
+    ok(_.isEqual(ds.column("one").data, [3]));
+    ok(_.isEqual(ds.column("two").data, [6]));
+  });
+
 
   test("updating a row with an incorrect type", function() {
     var ds = Util.baseSample();
diff --git a/test/unit/types.js b/test/unit/types.js
index a89ec8a..75c7a88 100644
--- a/test/unit/types.js
+++ b/test/unit/types.js
@@ -2,7 +2,7 @@
   
   var Dataset = global.Miso.Dataset;
 
-  var numbers = ['123', '0.34', '.23'];
+  var numbers = ['123', '0.34', '.23', '1.23e-2', '1.23e2'];
   var not_numbers = [null, NaN,undefined];
 
 
@@ -45,7 +45,7 @@
 
 
   test("Coerce number type", function() {
-    var coerced = [123, 0.34, 0.23];
+    var coerced = [123, 0.34, 0.23, 0.0123, 123];
     _.each(numbers, function(num, i) {
       equals(Dataset.types.number.coerce(num), coerced[i], "Should return true for a number");
     });
diff --git a/test/unit/views.js b/test/unit/views.js
index 92b5fcb..9f04af4 100644
--- a/test/unit/views.js
+++ b/test/unit/views.js
@@ -233,6 +233,45 @@
     equals(view.max("three"), 9);
     equals(view.min(["three"]), 7);
   });
+  
+
+  test("Basic view with adding a line to original dataset does not change if sync:false", function() {
+    var ds = Util.baseSample();
+    var view = ds.where({});
+    equal(view.length, 3, 'original view contains 3 lines');
+
+    ds.add({one:10, two:11, three:12});
+    equal(view.length, 3, 'adding one line doe not change the view');
+   });
+
+  test("Basic view with adding a line to original dataset, sync:true", function() {
+    var ds = Util.baseSyncingSample();
+    var view = ds.where({
+      rows:function(row){
+        return row.one>2
+      }
+    });
+    equal(view.length, 1, 'original view contains 1 lines');
+
+    ds.add({one:10, two:11, three:12});
+    ok(_.isEqual(view.column('three').data, [9,12]), 'adding one line to dataset flushes it to the to view');
+   });
+
+  test("derived view, filtered on ureported column, adding a line - issue 207", function() {
+    var ds = Util.baseSyncingSample();
+    
+    var view = ds.where({
+      columns:['three'],
+      rows:function(row){
+        return row.one>2;
+      }
+    });
+
+    ds.add({one:10, two:11, three:12});
+    ds.add({one:-10, two:-11, three:-12});
+    ok(_.isEqual(view.column('three').data, [9,12]), 'adding one line to dataset adds one to view');
+  });
+
 
   test("Using string syntax for columns", function() {
     var ds = Util.baseSample();