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+# sigmund
+
+Quick and dirty signatures for Objects.
+
+This is like a much faster `deepEquals` comparison, which returns a
+string key suitable for caches and the like.
+
+## Usage
+
+```javascript
+function doSomething (someObj) {
+  var key = sigmund(someObj, maxDepth) // max depth defaults to 10
+  var cached = cache.get(key)
+  if (cached) return cached
+
+  var result = expensiveCalculation(someObj)
+  cache.set(key, result)
+  return result
+}
+```
+
+The resulting key will be as unique and reproducible as calling
+`JSON.stringify` or `util.inspect` on the object, but is much faster.
+In order to achieve this speed, some differences are glossed over.
+For example, the object `{0:'foo'}` will be treated identically to the
+array `['foo']`.
+
+Also, just as there is no way to summon the soul from the scribblings
+of a cocaine-addled psychoanalyst, there is no way to revive the object
+from the signature string that sigmund gives you.  In fact, it's
+barely even readable.
+
+As with `util.inspect` and `JSON.stringify`, larger objects will
+produce larger signature strings.
+
+Because sigmund is a bit less strict than the more thorough
+alternatives, the strings will be shorter, and also there is a
+slightly higher chance for collisions.  For example, these objects
+have the same signature:
+
+    var obj1 = {a:'b',c:/def/,g:['h','i',{j:'',k:'l'}]}
+    var obj2 = {a:'b',c:'/def/',g:['h','i','{jkl']}
+
+Like a good Freudian, sigmund is most effective when you already have
+some understanding of what you're looking for.  It can help you help
+yourself, but you must be willing to do some work as well.
+
+Cycles are handled, and cyclical objects are silently omitted (though
+the key is included in the signature output.)
+
+The second argument is the maximum depth, which defaults to 10,
+because that is the maximum object traversal depth covered by most
+insurance carriers.