Won't parse string object with URL schema correctly, but silently fail

[renyuneyun]

As title says, the library won't parse and would silently fail subsequently when encountering a string object with URL schema.

Example

<>
  :regularString "some String";
  :urlString "https://github.com";
  :name "my name".

This would be successfully (but incorrectly) parsed into a graph containing (equivalent to)

<> :regularString "someString";
  :urlString .

Note the dangling object of :urlString, and missing of :name "my name".