overwrite=true does not work for fieldtarget

[moewew]

This came up in http://tex.stackexchange.com/q/353722/35864

It seems as though overwrite=true has no effect when used in a fieldsource/fieldtarget combination.

In the MWE below I would expect both notes to show 'foo', yet in worman the original value 'bar' is not overwritten.

\documentclass{article}
\usepackage{filecontents}
\usepackage[
  backend=biber,
  style=authoryear-comp,
]{biblatex}

\DeclareSourcemap{
  \maps[datatype=bibtex]{
    \map[overwrite=true]{
       \step[fieldsource=keywords, fieldtarget=note]
    }
  }
}

\begin{filecontents}{\jobname.bib}
@book{worman,
  author    = {Worman, Nancy},
  title     = {The Cast of Character},
  date      = 2002,
  keyword   = {foo},
  note      = {bar},
}
@book{wilde,
  author   = {Wilde, Oscar},
  title    = {The Importance of Being Earnest},
  year     = 1899,
  keywords = {foo},
}
\end{filecontents}

\addbibresource{\jobname.bib}

\begin{document}
\nocite{*}
\printbibliography
\end{document}

[plk]

This was a bug, now fixed in 2.8 DEV version.

[moewew]

Thank you for the swift reply. It works like a charm with the 2.8 DEV version from sourceforge.

[plk]

Yes, you need the DEV 2.8 version of biber which needs the DEV 3.8 version of biblatex.