On Thu, 8 May 2014 the LaTex 3 project submitted an update to the
latex tools
package.
Summary description: update to keyval in latex 20144 release License type: lppl
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as noted on the latex-l list the recent latex update included a bug fix to keyval that has proved to have incompatibilities with contributed packages, notably biblatex, so the change is being reverted.
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Thanks for the upload.
For the CTAN Team Rainer Schöpf