Copying a content type will give the wrong identifier name to the copy:

original identifier: testing
copy identifier: testing_db0491278ca60a4fcce6b858cf472aad

Steps:
(on Admin interface)
1 - create content type

• Name: CType test
• Identifier: testing
  2 - Add a ezstring identifier with Name: "name"

(on a REST client)
1 - do a request

• type: "COPY"
• url: /api/content/types/48
  (where 48 is the new content type ID)

(on Admin interface)
1 - Verify the identifier of the copy content type