We believe that your issue has been closed by the upload of
Version 0.3.61 of grml-etc-core from Frank Terbeck <ft@grml.org>.
The explanation is attached below

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Format: 1.8
Date: Fri, 05 Dec 2008 18:48:45 +0100
Source: grml-etc-core
Binary: grml-etc-core
Architecture: source all
Version: 0.3.61
Distribution: unstable
Urgency: low
Maintainer: Michael Prokop <mika@grml.org>
Changed-By: Frank Terbeck <ft@grml.org>
Description: 
 grml-etc-core - core ecetera files for the grml system
Changes: 
 grml-etc-core (0.3.61) unstable; urgency=low
 .
   * zshrc: Fix a bug in urlencode(), thanks to Baptiste Daroussin
     [Closes: issue583]
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Fixed in current git:
http://git.grml.org/?p=grml-etc-
core.git;a=commit;h=36b19d3d797d334b963eb77e608250e930742e76

Thanks for reporting bapt, thanks for the commit frank.

regards,
-mika-

urlencode fails when the hexa code is in the forme 0? for example tab code is
%09 but urlencode report %9 the solution is to pad the result of hexa
transformation :
replace ${(j::)input/(#b)([^A-Za-z0-9_.!~*\'\(\)-])/%$(([##16]#match))} line 822
et replace it by
${(j::)input/(#b)([^A-Za-z0-9_.!~*\'\(\)-])/%${(l:2::0:)$(([##16]#match))}}