credis_zincrby doesn't work

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What steps will reproduce the problem?
1. credis_zincrby(rh, "mykey", 1.0, "mymember", &new_score)
2. ZRANGE mykey 0 -1 (in telnet connect to server)

What is the expected output? What do you see instead?

I would expect something like:
*1
$8
mymember

Instead I get:
*1
$1
8

What version of the product are you using? On what operating system?

credis 0.2.3
redis 2.2.2

Please provide any additional information below.

It appears that credis increases the score of strlen("mymember") rather than 
"mymember".

Original issue reported on code.google.com by [email protected] on 15 Mar 2011 at 5:19