Clarify an exception message.
Build pairs before calling the parent constructor.
[auto] Merge from Realdom

    • #f7ea947 — Clarify an exception message. (Ivan Enderlin, 2013-01-05)
    • #e14eec2 — Build pairs before calling the parent constructor. (Ivan Enderlin, 2013-01-05)

---

Merge remote branch 'library-realdom/master'