Fixes:

• Len and Cap could not be embedded in JSON, SubJSONOf and SuperJSONOf. Fixed;
• Bag and Set didn't implement TypeBehind() method. Fixed;
• JSONPointer expectedValue and JSON placeholders didn't have the same behavior. Now the pointed data is JSON-unmarshaled into a value using the same type of expectedValue (for JSONPointer) or any placeholder (for JSON) before comparison;
• Catch TypeBehind() method didn't use the type of target when the type behind expectedValue could not be determined. Fixed;
• (*tdhttp.TestApi).CmpJSONBody(nil) panicked. Fixed;
• and some typos fixed.

Enjoy!