Added some notes about observed behavior and fixed return types for missing/absent keys.

js/test_cases/helpers_size/README.md

@@ -7,3 +7,12 @@ Excerpt from [the DustJS tutorial](https://github.com/linkedin/dustjs/wiki/Dust-
     Undefined, 0, empty string - zero
     Any other value - length after conversion to string
 
+This appears to be inaccurate (probably out of date because that tutorial was deprecated in favor of [dustjs.com](https://www.dustjs.com/), but the latter is incomplete and lacking any reference to the `@size` helper.
+
+Corrections
+-----------
+- Booleans are 0, not converted to strings
+
+Oddities
+--------
+Reference parameters (like `foo="{bar}"`) are usually treated as strings but it seems if it contains ONLY a reference to a value and not anything else, then it is still treated as a number.

js/test_cases/helpers_size/inputobject.json

@@ -1,6 +1,6 @@
 {
   "val": {
-    "pet": "cat",
-    "name": "fluffy"
+    "name": "fluffy",
+    "pet": "cat"
   }
 }

js/test_cases/helpers_size/main.dust

@@ -1,3 +1,3 @@
 The size of val ({val|js|s}) is {@size key=val /}{~n}
-The size of "{val}" is {@size key="{val}" /}{~n}
+The size of "{~lb}val{~rb}" is {@size key="{val}" /}{~n}
 The size with no key is {@size /}{~n}