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Coder.php misparses floats on little-endian architectures

What steps will reproduce the problem?
1. Generate a (correct) Messagepacked structure containing a float (say, 
1234.5).
2. Parse it with Coder.php
3. Compare it with the original number.

What is the expected output? What do you see instead?
- Expected output, 1234.5... actual output, something*10^41.

What version of the product are you using? On what operating system?
- i686 AFAIK, on an Amazon instance.

Please provide any additional information below.
- Messagepack specifies big-endian floats, so on little-endian hardware I had 
to do this instead (Coder.php line 196):
  $unpack = unpack('f', strrev(substr($messagePack, 0, 4)));

Original issue reported on code.google.com by [email protected] on 30 Sep 2013 at 12:04

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