diff --git a/09_reshaping.ipynb b/09_reshaping.ipynb
index 59e423b..d896bc6 100644
--- a/09_reshaping.ipynb
+++ b/09_reshaping.ipynb
@@ -204,8 +204,10 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "  0.280078 seconds (25.93 k allocations: 230.290 MiB, 32.04% gc time)\n",
-      "  0.232177 seconds (102.85 k allocations: 5.576 MiB)\n"
+      "  0.288607 seconds (25.97 k allocations: 230.395 MiB, 31.10% gc time)\n",
+      "  0.252100 seconds (127 allocations: 228.889 MiB, 51.72% gc time)\n",
+      "  0.258912 seconds (102.99 k allocations: 5.480 MiB)\n",
+      "  0.000139 seconds (85 allocations: 5.250 KiB)\n"
      ]
     }
    ],
@@ -213,6 +215,8 @@
     "bigx = DataFrame(rand(10^6, 10)) # a test comparing creation of new DataFrame and a view\n",
     "bigx[:id] = 1:10^6\n",
     "@time melt(bigx, :id)\n",
+    "@time melt(bigx, :id)\n",
+    "@time meltdf(bigx, :id)\n",
     "@time meltdf(bigx, :id);"
    ]
   },
@@ -224,15 +228,15 @@
     {
      "data": {
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+       "<table class=\"data-frame\"><thead><tr><th></th><th>id</th><th>id2</th><th>a1</th><th>a2</th></tr></thead><tbody><tr><th>1</th><td>1</td><td>'a'</td><td>0.458145</td><td>0.142355</td></tr><tr><th>2</th><td>1</td><td>'b'</td><td>0.799502</td><td>0.631973</td></tr><tr><th>3</th><td>1</td><td>'c'</td><td>0.665952</td><td>0.204755</td></tr></tbody></table>"
       ],
       "text/plain": [
        "3×4 DataFrames.DataFrame\n",
        "│ Row │ id │ id2 │ a1       │ a2       │\n",
        "├─────┼────┼─────┼──────────┼──────────┤\n",
-       "│ 1   │ 1  │ 'a' │ 0.834752 │ 0.593618 │\n",
-       "│ 2   │ 1  │ 'b' │ 0.25992  │ 0.937631 │\n",
-       "│ 3   │ 1  │ 'c' │ 0.220984 │ 0.279682 │"
+       "│ 1   │ 1  │ 'a' │ 0.458145 │ 0.142355 │\n",
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+       "│ 3   │ 1  │ 'c' │ 0.665952 │ 0.204755 │"
       ]
      },
      "execution_count": 8,
@@ -252,18 +256,18 @@
     {
      "data": {
       "text/html": [
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+       "<table class=\"data-frame\"><thead><tr><th></th><th>variable</th><th>value</th><th>id</th><th>id2</th></tr></thead><tbody><tr><th>1</th><td>a1</td><td>0.458145</td><td>1</td><td>'a'</td></tr><tr><th>2</th><td>a1</td><td>0.799502</td><td>1</td><td>'b'</td></tr><tr><th>3</th><td>a1</td><td>0.665952</td><td>1</td><td>'c'</td></tr><tr><th>4</th><td>a2</td><td>0.142355</td><td>1</td><td>'a'</td></tr><tr><th>5</th><td>a2</td><td>0.631973</td><td>1</td><td>'b'</td></tr><tr><th>6</th><td>a2</td><td>0.204755</td><td>1</td><td>'c'</td></tr></tbody></table>"
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       "text/plain": [
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-       "│ 5   │ a2       │ 0.937631 │ 1  │ 'b' │\n",
-       "│ 6   │ a2       │ 0.279682 │ 1  │ 'c' │"
+       "│ 1   │ a1       │ 0.458145 │ 1  │ 'a' │\n",
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+       "│ 6   │ a2       │ 0.204755 │ 1  │ 'c' │"
       ]
      },
      "execution_count": 9,
@@ -283,18 +287,18 @@
     {
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+       "<table class=\"data-frame\"><thead><tr><th></th><th>variable</th><th>value</th></tr></thead><tbody><tr><th>1</th><td>x1</td><td>0.284223</td></tr><tr><th>2</th><td>x1</td><td>0.498334</td></tr><tr><th>3</th><td>x1</td><td>0.84188</td></tr><tr><th>4</th><td>x2</td><td>0.845803</td></tr><tr><th>5</th><td>x2</td><td>0.722629</td></tr><tr><th>6</th><td>x2</td><td>0.995074</td></tr></tbody></table>"
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+       "│ 6   │ x2       │ 0.995074 │"
       ]
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      "execution_count": 10,
@@ -314,18 +318,18 @@
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+       "<table class=\"data-frame\"><thead><tr><th></th><th>variable</th><th>value</th><th>key</th></tr></thead><tbody><tr><th>1</th><td>x1</td><td>0.876846</td><td>1</td></tr><tr><th>2</th><td>x1</td><td>0.0686333</td><td>1</td></tr><tr><th>3</th><td>x1</td><td>0.0815149</td><td>1</td></tr><tr><th>4</th><td>x2</td><td>0.984013</td><td>1</td></tr><tr><th>5</th><td>x2</td><td>0.139363</td><td>1</td></tr><tr><th>6</th><td>x2</td><td>0.859373</td><td>1</td></tr></tbody></table>"
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+       "│ Row │ variable │ value     │ key │\n",
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+       "│ 6   │ x2       │ 0.859373  │ 1   │"
       ]
      },
      "execution_count": 11,
@@ -354,15 +358,15 @@
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+       "<table class=\"data-frame\"><thead><tr><th></th><th>id</th><th>id2</th><th>a1</th><th>a2</th></tr></thead><tbody><tr><th>1</th><td>1</td><td>'a'</td><td>0.754369</td><td>0.095943</td></tr><tr><th>2</th><td>1</td><td>'b'</td><td>0.494067</td><td>0.227082</td></tr><tr><th>3</th><td>1</td><td>'c'</td><td>0.622234</td><td>0.791082</td></tr></tbody></table>"
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       "text/plain": [
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-       "│ 3   │ 1  │ 'c' │ 0.556724 │ 0.842527  │"
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      "execution_count": 12,
@@ -382,15 +386,15 @@
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       "text/plain": [
        "3×4 DataFrames.DataFrame\n",
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-       "│ 3   │ 1  │ 'c' │ 0.556724 │ 0.842527  │"
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@@ -399,18 +403,18 @@
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+       "<table class=\"data-frame\"><thead><tr><th></th><th>variable</th><th>value</th><th>id</th><th>id2</th></tr></thead><tbody><tr><th>1</th><td>a1</td><td>0.754369</td><td>1</td><td>'a'</td></tr><tr><th>2</th><td>a1</td><td>0.494067</td><td>1</td><td>'b'</td></tr><tr><th>3</th><td>a1</td><td>0.622234</td><td>1</td><td>'c'</td></tr><tr><th>4</th><td>a2</td><td>0.095943</td><td>1</td><td>'a'</td></tr><tr><th>5</th><td>a2</td><td>0.227082</td><td>1</td><td>'b'</td></tr><tr><th>6</th><td>a2</td><td>0.791082</td><td>1</td><td>'c'</td></tr></tbody></table>"
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-       "│ 5   │ a2       │ 0.0314807 │ 1  │ 'b' │\n",
-       "│ 6   │ a2       │ 0.842527  │ 1  │ 'c' │"
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+       "│ 5   │ a2       │ 0.227082 │ 1  │ 'b' │\n",
+       "│ 6   │ a2       │ 0.791082 │ 1  │ 'c' │"
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      "metadata": {},
@@ -431,15 +435,15 @@
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+       "<table class=\"data-frame\"><thead><tr><th></th><th>id2</th><th>a1</th><th>a2</th></tr></thead><tbody><tr><th>1</th><td>'a'</td><td>0.754369</td><td>0.095943</td></tr><tr><th>2</th><td>'b'</td><td>0.494067</td><td>0.227082</td></tr><tr><th>3</th><td>'c'</td><td>0.622234</td><td>0.791082</td></tr></tbody></table>"
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-       "│ 2   │ 'b' │ 0.437016 │ 0.0314807 │\n",
-       "│ 3   │ 'c' │ 0.556724 │ 0.842527  │"
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+       "│ 3   │ 'c' │ 0.622234 │ 0.791082 │"
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      "execution_count": 14,
@@ -459,15 +463,15 @@
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-       "│ 3   │ 1  │ 'c' │ 0.556724 │ 0.842527  │"
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       ]
      },
      "execution_count": 15,
@@ -494,13 +498,13 @@
     {
      "data": {
       "text/html": [
-       "<table class=\"data-frame\"><thead><tr><th></th><th>id</th><th>a1</th><th>a2</th></tr></thead><tbody><tr><th>1</th><td>1</td><td>0.556724</td><td>0.842527</td></tr></tbody></table>"
+       "<table class=\"data-frame\"><thead><tr><th></th><th>id</th><th>a1</th><th>a2</th></tr></thead><tbody><tr><th>1</th><td>1</td><td>0.622234</td><td>0.791082</td></tr></tbody></table>"
       ],
       "text/plain": [
        "1×3 DataFrames.DataFrame\n",
        "│ Row │ id │ a1       │ a2       │\n",
        "├─────┼────┼──────────┼──────────┤\n",
-       "│ 1   │ 1  │ 0.556724 │ 0.842527 │"
+       "│ 1   │ 1  │ 0.622234 │ 0.791082 │"
       ]
      },
      "execution_count": 16,
@@ -521,18 +525,18 @@
     {
      "data": {
       "text/html": [
-       "<table class=\"data-frame\"><thead><tr><th></th><th>variable</th><th>value</th></tr></thead><tbody><tr><th>1</th><td>x1</td><td>0.220844</td></tr><tr><th>2</th><td>x1</td><td>0.784599</td></tr><tr><th>3</th><td>x1</td><td>0.338827</td></tr><tr><th>4</th><td>x2</td><td>0.390671</td></tr><tr><th>5</th><td>x2</td><td>0.150449</td></tr><tr><th>6</th><td>x2</td><td>0.605126</td></tr></tbody></table>"
+       "<table class=\"data-frame\"><thead><tr><th></th><th>variable</th><th>value</th></tr></thead><tbody><tr><th>1</th><td>x1</td><td>0.678752</td></tr><tr><th>2</th><td>x1</td><td>0.929795</td></tr><tr><th>3</th><td>x1</td><td>0.884891</td></tr><tr><th>4</th><td>x2</td><td>0.925154</td></tr><tr><th>5</th><td>x2</td><td>0.474071</td></tr><tr><th>6</th><td>x2</td><td>0.731631</td></tr></tbody></table>"
       ],
       "text/plain": [
        "6×2 DataFrames.DataFrame\n",
        "│ Row │ variable │ value    │\n",
        "├─────┼──────────┼──────────┤\n",
-       "│ 1   │ x1       │ 0.220844 │\n",
-       "│ 2   │ x1       │ 0.784599 │\n",
-       "│ 3   │ x1       │ 0.338827 │\n",
-       "│ 4   │ x2       │ 0.390671 │\n",
-       "│ 5   │ x2       │ 0.150449 │\n",
-       "│ 6   │ x2       │ 0.605126 │"
+       "│ 1   │ x1       │ 0.678752 │\n",
+       "│ 2   │ x1       │ 0.929795 │\n",
+       "│ 3   │ x1       │ 0.884891 │\n",
+       "│ 4   │ x2       │ 0.925154 │\n",
+       "│ 5   │ x2       │ 0.474071 │\n",
+       "│ 6   │ x2       │ 0.731631 │"
       ]
      },
      "execution_count": 17,