WIP - add extractor, generate snippet_data

node_modules/sift/changelog.md

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+### 3.3.x
+
+- `$in` now uses `toString()` when evaluating objects. Fixes #116.
+
+#### 2.x
+
+- `use()` now uses a different format:
+
+```javascript
+sift.use({
+  $operator: function(a) {
+    return function(b) {
+      // compare here
+    };
+  }
+})
+```
+
+- all operators are traversable now
+- fix #58.