----- Original Message ----
From: John A. De Goes
AFAIK, the only language where that sort of wheel reinvention is popular is Java. But then Java seems to encourage wheel reinvention anyhow ;-)
The Java reinventions look and feel like Java, because they're native implementations. This is even more important in Haskell where the differences between Haskell and C is about as large as you can get.
The Java reinventions largely exist because of the huge deployment-time benefits you get from pure-Java code (cross-platform portability of compiled (byte) code, dynamic loading of compiled code over a network, etc.). Such reinventions are much less important for Haskell, since the typical deployment model for a Haskell program is much closer to that of a C program than a Java program or even a Python program.