# Change giveninits option within document (BibLaTeX)

I would like to know whether it is possible to change the giveninits option of BibLaTeX within the document, when having several bibliographies. In the MWE below I have two separate bibliographies in two refsegments. I would like the first to use full first names of the authors (giveninits=false), while the second should abbreviate first names to their initials (giveninits=true). newrefcontext does not seem to work for this.

\documentclass[a4paper,11pt]{article}
\usepackage{filecontents}
\usepackage[backend=biber,%
style=authoryear,%
giveninits=false,%
maxcitenames=2]{biblatex}
%\DeclareRefcontext{inits}{giveninits=true}

\begin{filecontents}{Lit.bib}
@ARTICLE{Aguilera-Franco:2001,
author = {Noemi Aguilera-Franco and Ulises Hern\'{a}ndez-Romano and Peter A.
Allison},
year = {2001},
title = {Biostratigraphy and Environmental Changes Across the {Cenomanian--Turonian}
Boundary, Southern {Mexico}},
journal = {Journal of South American Earth Sciences},
volume = {14},
number = {2},
pages = {237--255},
doi = {10.1016/S0895-9811(01)00014-1}
}

@ARTICLE{KrautwigEtAl:1998,
author = {Dirk W. H. Krautwig and Lukas Hottinger and Heinrich Zankl},
year = {1998},
title = {The Lamellar-Perforate, Arborescent and Coloured Foraminifers \textit{Miniacina},
journal = {Facies},
volume = {38},
pages = {89--102},
doi = {10.1007/BF02537359}
}
\end{filecontents}

\begin{document}
\section{A section}
\newrefsegment
Test \textcite{Aguilera-Franco:2001} and \textcite{KrautwigEtAl:1998}.

\printbibliography[segment=1]

\section{Another section}
\newrefsegment
Test \textcite{Aguilera-Franco:2001}.

%\newrefcontext{inits} %DOES NOT WORK
\printbibliography[segment=2]
\end{document}


\toggletrue{abx@bool@giveninits}

after the \newrefcontext.
The manual lists only sorting, sortingnamekeyscheme and labelprefix among the options that can be passed to \DeclareRefcontext. So you can't use giveninits there.
But giveninits=true only sets the toggle abx@bool@#1inits, so simply toggling it to true should give the expected result.